Database Users

SD read/write speed causing lag on my HD2 but...

So I downloaded this app call H2testw.exe to test for legit sdcards but it also tells the read/write speed as well. I am testing my 8gb and 1gb cards. I set it to write a 300 mb files to the card and verify it.
Info about Android running on the two cards:
8gb = lags coming out of sleep, touch screen freezes, write~7.5 mb/s, read~12mb/s
1gb = no lags, no touch screen, write~4.3mb, read~13mb/s
I'm confused. The read speed is almost the same yet the 1gb microsd is more responsive running MDJ android compared to the 8gb microsd. Any thought?
UPDATE: Maybe this is what's causing the problem. Stolen from Engadget.
What we've learned from our tipsters and from documents culled from Microsoft, Samsung, and others is that the big issue is random access performance -- a figure that isn't taken into account in a card's class rating. Ironically, Microsoft discovered in its testing that cards with higher class ratings actually performed worse on Windows Phone 7 because the tweaks card manufacturers make to achieve high sequential throughput can actually hurt random access times. There's some rocket science involved here, but basically, it's a tradeoff and a bit of a gamble -- if a manufacturer tunes a card for a high class rating, it takes more time to access the first byte at a new location on the card because it's optimizing access for that area of memory, but once it does that, it can blast sequential bytes at very high speed. If you've got a lot of small reads or writes you need to make to different files at different locations in the card's memory, though, you really start to suffer. Cards with lower class ratings tend to spend less time optimizing sequential access prior to the first read / write operation, so it can move around the card (that is, access it randomly) much faster.
Click to expand...
Click to collapse
Source:
http://www.engadget.com/2010/11/17/windows-phone-7s-microsd-mess-the-full-story-and-how-nokia-ca/

They are probably different classes, plus it naturally takes longer with a bigger card because there's more files and more space to read and write
Sent from my HD2 Nexus One using XDA App

I get screen freezes with 8gb and up but rarely with new builds, haven't tried a card higher than class 6
Also I'm on radio 2.15
Sent from my HD2 Nexus One using XDA App

Oddly enough, I have two 8gb cards, one class 4 the other class 6, and they hiccup more than my 16gb class 2.
Now that is weird.

I'm lost myself...I'm thinking off just getting me a 4gb card and hope for the best...

I heard the 16gb class 10 is perfect but it still cost to much for nand to be around the corner
Sent from my HD2 Nexus One using XDA App

16 gb class 10 no lag cost me over 100 pounds tho
Sent from my HTC Desire using XDA App

Cheapest 16GB - lags from time to time :/
Maybe defragmentation may help?

tomus said:
Cheapest 16GB - lags from time to time :/
Maybe defragmentation may help?
Click to expand...
Click to collapse
Defrag wont help...scan for errors...try to have only the android folder and see if it makes a different ..

Btw, guys...
all sd cards are not created equal. all sd cards of the same CLASS are not created equal.
Check out the ongoing drama with win7 phones with SD slots....
class measures throughput, what affects the SOD and related issues is random access speed, not throughput so much.

It's just my 2 cents, but I've tested Class 2, 4, and 6 MicroSDHC cards and found very little noticeable difference once Android is fully booted up and running on the HD2. Moreover, none of the cards create screen freezes or SOD issues or high battery drain problems here. That said, I have noticed that the actual boot time and file transfer speed (from the PC to the card) can be faster on average with quality higher class rated cards of the same size. Also, I've found that the larger the card size, the longer the android boot time, no matter the class. Guess that makes sense, as the system need to read more sectors with larger size cards. Please note that I've only tested Sandisk, Toshiba, TopRam and Samsung cards to date. What's kind of strange is that the Class 2 16 & 32GB Sandisk cards run just as well or slightly better for some reason than some of my higher class rated cards. Go figure...
As far as issues go, I recommend only using quality brand name cards, no ebay fakes or cheap no name brands. Also, I've had great luck formatting all my cards with SD Formatter v2.0 and v3.0, using the quick format mode with the standard 32kb cluster size.
Best to all,
R

rhacy said:
It's just my 2 cents, but I've tested Class 2, 4, and 6 MicroSDHC cards and found very little noticeable difference once Android is fully booted up and running on the HD2. Moreover, none of the cards create screen freezes or SOD issues or high battery drain problems here. That said, I have noticed that the actual boot time and file transfer speed (from the PC to the card) can be faster on average with quality higher class rated cards of the same size. Also, I've found that the larger the card size, the longer the android boot time, no matter the class. Guess that makes sense, as the system need to read more sectors with larger size cards. Please note that I've only tested Sandisk, Toshiba, TopRam and Samsung cards to date. What's kind of strange is that the Class 2 16 & 32GB Sandisk cards run just as well or slightly better for some reason than some of my higher class rated cards. Go figure...
As far as issues go, I recommend only using quality brand name cards, no ebay fakes or cheap no name brands. Also, I've had great luck formatting all my cards with SD Formatter v2.0 and v3.0, using the quick format mode with the standard 32kb cluster size.
Best to all,
R
Click to expand...
Click to collapse
Great info here. I think I will just order me a new card from a reputable brand. Maybe my card is just getting old. Maybe a 16gb from Amazon will do. They aren't too expensive nowaday. ~$26.

Does the Radio version effects the lag of the sd card? Or the kernel?

distruct said:
Does the Radio version effects the lag of the sd card? Or the kernel?
Click to expand...
Click to collapse
No, not on the sd but radio does effect how the build will run, your phone calls, your battery.

Could this be the reason why class don't matter on hd2 android? I mean even some class 4 & 6 have lag and sod problem. I pulled this bit from engadget. It's an article on wp7 and memory card issues.
What we've learned from our tipsters and from documents culled from Microsoft, Samsung, and others is that the big issue is random access performance -- a figure that isn't taken into account in a card's class rating. Ironically, Microsoft discovered in its testing that cards with higher class ratings actually performed worse on Windows Phone 7 because the tweaks card manufacturers make to achieve high sequential throughput can actually hurt random access times. There's some rocket science involved here, but basically, it's a tradeoff and a bit of a gamble -- if a manufacturer tunes a card for a high class rating, it takes more time to access the first byte at a new location on the card because it's optimizing access for that area of memory, but once it does that, it can blast sequential bytes at very high speed. If you've got a lot of small reads or writes you need to make to different files at different locations in the card's memory, though, you really start to suffer. Cards with lower class ratings tend to spend less time optimizing sequential access prior to the first read / write operation, so it can move around the card (that is, access it randomly) much faster.
Click to expand...
Click to collapse
Source:
http://www.engadget.com/2010/11/17/windows-phone-7s-microsd-mess-the-full-story-and-how-nokia-ca/

azzzz said:
Could this be the reason why class don't matter on hd2 android? I mean even some class 4 & 6 have lag and sod problem. I pulled this bit from engadget. It's an article on wp7 and memory card issues.
Source:
http://www.engadget.com/2010/11/17/windows-phone-7s-microsd-mess-the-full-story-and-how-nokia-ca/
Click to expand...
Click to collapse
Obviously.
Been saying this for a while, myself - I have experimented, and I get SOD every time with my 16gb class 6 card, but rarely with my class 2 8gb, and never ever (and, tbh, better responsiveness overall) with my 2gb NON-HC card

enneract said:
Obviously.
Been saying this for a while, myself - I have experimented, and I get SOD every time with my 16gb class 6 card, but rarely with my class 2 8gb, and never ever (and, tbh, better responsiveness overall) with my 2gb NON-HC card
Click to expand...
Click to collapse
I hope so...my class 2 16gb will be here in a couple of days...i hope it's faster than my current 8gb class 4....
Update: my 16gb class 2 sandisk is here. Things have improved alot. Wake up is faster now with less lag, market download speed is faster now (10kb vs 100kb). Hopefully system performance will be better...

Kingston Memory Cards do not support partitions

I purchased a Kingston 16 GB class 10 microsd card for my Nexus One. I set up a 1 GB ext3 partition and the rest was fat32. When I tested the performace of the card its read performance was within specifications but its write performance was only about 3 mb/s. I corresponded with Kingston support and they sent me a new one. The new one performed much better but would not work long before it generated so many errors the phone would hang. After I described my configuration to Kingston here is the reply from their technical support.
Hello Lynn,
We do not support any of our flash cards as boot disks or to use to run an OS. These cards are meant to be used in cameras, smartphones, etc as storage devices. It is designed to have a single partition. We suggest you return this card for a refund. If you cannot return this to your place of purchase, please provide a copy of your receipt to see if we can provide a refund for you.
If you have any other questions or concerns, please feel free to reply to this e-mail with full email history. Thank you for using Kingston on-line technical support.
Regards,
Glenn Neumeister
Kingston Technology
Technical Support
8am - 5pm Monday through Friday PST

Sparky19 said:
We do not support any of our flash cards as boot disks or to use to run an OS.
Click to expand...
Click to collapse
Just means they do not provide support. I have used them in the past and they worked fine

I'm using the same card and its working fine for me
Sent from my Nexus One using XDA App

I have that card too and originally let my Nexus format it. I had write performance of about 700 KB/s - 1.3 MB/s. Awful. Then I formatted it again on Windows with a bigger size of blocks. IIRC, the ideal I found for top speeds was 16 KBytes blocks. Anything higher and it'd slowly go down, anything lower and I had crippled speed. I think it has to do with the size of memory pages on that card.

I have that card and I use it with both a fat and ext3 partition no problem. It is quite slow though (they call this class 10?).

Title != Problem. Fix it.
And most likely what you're experiencing is filesystem format type (block size, clusters, etc) AND block alignment. You'll have to google for the details, but if the card has a 4K physical block size, you'll want the blocks to be 4k and start at the start of each. Otherwise to write 4k you write TWO blocks on the card.
Same deal with SSD's. Partitioning and formatting has be optimized for them to perform their best.

[Q] SD Card Worth It?

I am going to pick one of these up, but before I did, had a quick question (anyone with a WP7 can answer)
Do you feel that 8gb is enough space? Or do you wish you had more? Should I get an SD Card?

Most definitely. I have loaded most of my music and a few videos and I already used over 6GB. That's pretty much all the stock phone has. Now, I have over 14GB still left. Might put some movies on it.

My only disappointment in the focus is the 8GB stock NAND. For a $199 on contract device, 16GB really should be the minimum, especially considering a few other WP7 phones, to say nothing of Android phones and the iPhone, all start at $199 with 16GB.
That said, adding the SD card isn't that big a deal as long as you do it before you've filled the device up. For some reason there seems to be no ability to do a full backup of the phone by any means I've been able to find.

The problem with the SD Cards is that there's intense confusion/miscommunication about which cards work well. Just because it works with 6GB doesn't mean anything. What seems to happen is once you get to 8GB filled, the phone's performance takes a nose-dive, sometimes leading to losing all data.

"Enough space" depends on you, not us. I have an iPhone, iPad and iPod, all 16GB units, each with some 14GB or so of music & apps on them so it the first thing I did when I brought the Focus home was slap an 8GB card in there, format it and load it up. I have maybe 2GB free and it's worked without a single glitch for the past two weeks. For reference, mine is a Sandisk class 2. People seem to have problems with cards other than Sandisk and other than class 2 and I noticed absolutely no performance problems so if you're going to try it, try that and keep the receipt in case you need to return or swap it should something go sour.

Enough Space?
I agree with Mark, whether there is enough space or not really depends on what your usage requirements are.
I had a 32GB Zune and when I bought my Samsung Focus the Zune had over 20GB of data on it. So for me adding and 32GB SD card to the Focus was not only a desire but a very strong selling point for the Phone.
And yes, I am seeing a few issues with the Sandisk Card that is in it. Currently they are not enough to make me yank the Card because I (again) bought the device to specifically be a convergence device for myself and I am at heart a tester and tinkerer so figuring how exactly how WP7 works.doesn't work with an SD Card and the statement that MS and Samsung are working on a fix is enough for me right now.
Smaller Sized Cards seem to be more reliable than larger cards (not to mention less expensive) but that appears to anecdotal evidence as well. My 32GB Sandisk only causes freezes and resets when on Battery for example and I've not had anyone else confirm if they are seeing the same.
Not great answers but, hey, this is the fun of learning as we go along...
- MEK

FishFaceMcGee said:
The problem with the SD Cards is that there's intense confusion/miscommunication about which cards work well. Just because it works with 6GB doesn't mean anything. What seems to happen is once you get to 8GB filled, the phone's performance takes a nose-dive, sometimes leading to losing all data.
Click to expand...
Click to collapse
I have more than 11GB on my Focus with no issues at all. No slow-downs, no hiccups, no data loss period. I am currently using a PNY 16GB Class 2 card. I previously had a Centon 8GB Class 6 card with the same results.
If you read the thread on MicroSD cards, it seems there are some cards that have been working pretty much flawlessly. Both of the cards I mentioned have worked perfectly for me. I gave the 8GB to a friend and he is using it in his Focus as well.

For me, to really make a portable phone/audio/video device be best for me it would need at least 150GB of storage... and a few TB if i wanted to listen to music lossless and a few movies.

MKohlman said:
I agree with Mark, whether there is enough space or not really depends on what your usage requirements are.
I had a 32GB Zune and when I bought my Samsung Focus the Zune had over 20GB of data on it. So for me adding and 32GB SD card to the Focus was not only a desire but a very strong selling point for the Phone.
And yes, I am seeing a few issues with the Sandisk Card that is in it. Currently they are not enough to make me yank the Card because I (again) bought the device to specifically be a convergence device for myself and I am at heart a tester and tinkerer so figuring how exactly how WP7 works.doesn't work with an SD Card and the statement that MS and Samsung are working on a fix is enough for me right now.
Smaller Sized Cards seem to be more reliable than larger cards (not to mention less expensive) but that appears to anecdotal evidence as well. My 32GB Sandisk only causes freezes and resets when on Battery for example and I've not had anyone else confirm if they are seeing the same.
Not great answers but, hey, this is the fun of learning as we go along...
- MEK
Click to expand...
Click to collapse
You know, I was thinking about this the other day...the phone has 8GB of internal memory and if you put in an SD card it stripes data across it and the internal memory. If the card is 8GB or smaller that's fine but what happens if the SD card is larger than internal memory? It doesn't stripe the first 8GB and set the rest up as another partition and it does appear to use but it can't be striped. Now you've mentioned that smaller sized cards work better and my 8GB card works perfectly. I wonder if the file system's attempt to work with a larger card is inherently unstable? I know that if you put two different sized drives in a Windows box and stripe across them you will only end up with double the size of the smallest drive, not the actual sum of the two. Might be an interesting poll...indicate the size of your SD card and if the phone has been 100% stable since inserting it.

markgamber said:
You know, I was thinking about this the other day...the phone has 8GB of internal memory and if you put in an SD card it stripes data across it and the internal memory. If the card is 8GB or smaller that's fine but what happens if the SD card is larger than internal memory? It doesn't stripe the first 8GB and set the rest up as another partition and it does appear to use but it can't be striped. Now you've mentioned that smaller sized cards work better and my 8GB card works perfectly. I wonder if the file system's attempt to work with a larger card is inherently unstable? I know that if you put two different sized drives in a Windows box and stripe across them you will only end up with double the size of the smallest drive, not the actual sum of the two. Might be an interesting poll...indicate the size of your SD card and if the phone has been 100% stable since inserting it.
Click to expand...
Click to collapse
I'm not totally convinced based on comments in blogs that the disks are "striped". I think a lot of people are saying this and maybe using the term out of context and everyone just keeps using it. Has Microsoft actually come out to say "WP7 performs RAID 0 configuration"? For a phone OS which was never intended to see anything other than a single drive, don't you think throwing a RAID controller in there just for kicks is a little absurd?
The other term is "span" and if I had money, I'd bet that the two disks were spanned as a single partition, as opposed to striping like RAID 0 does.
Despite all of that, I have tried a 16gb class 4 with more issues than I cared for and currently have an 8gb class 4 with negligible issues. Any card you get, I'd run on Vista/Windows 7 and test for ReadyBoost. That at least tests the card for random access speed, which is important. My 16gb failed readyboost and had lots of issues in my Focus, whereas the 8gb passed and the only issues I've seen with that one are issues that other people might have experienced on their own phones sans sd card.

hyperzulu said:
I'm not totally convinced based on comments in blogs that the disks are "striped". I think a lot of people are saying this and maybe using the term out of context and everyone just keeps using it. Has Microsoft actually come out to say "WP7 performs RAID 0 configuration"? For a phone OS which was never intended to see anything other than a single drive, don't you think throwing a RAID controller in there just for kicks is a little absurd?
The other term is "span" and if I had money, I'd bet that the two disks were spanned as a single partition, as opposed to striping like RAID 0 does.
Despite all of that, I have tried a 16gb class 4 with more issues than I cared for and currently have an 8gb class 4 with negligible issues. Any card you get, I'd run on Vista/Windows 7 and test for ReadyBoost. That at least tests the card for random access speed, which is important. My 16gb failed readyboost and had lots of issues in my Focus, whereas the 8gb passed and the only issues I've seen with that one are issues that other people might have experienced on their own phones sans sd card.
Click to expand...
Click to collapse
I've read both, striped and spanned...who knows. Considering how slow SD memory always was in old WinMo devices, I didn't think it absurd to stripe data to provide the same kind of speed boost you get when striping hard drives. Hard as it might be to believe, it may have just been that WinMo was slow. I hadn't thought of the readyboost test, that's a good idea. Readyboost is pretty picky.

Xperia z3c max sdxc size

I was having a conversation with a friend who claims that most phones made in the last 2 years can take a sdxc card up to 2tb and the 128gb limit mentioned is null. I saw some new phones listed as 200gb max instead of the 128, but would they take up to 2tb I wonder. What do you guys think about this

i think it can be capable of having 128gbs without problems, no more, but lets wait until someone confirms it having a sony running more than 128gigs

AlfredS said:
i think it can be capable of having 128gbs without problems, no more, but lets wait until someone confirms it having a sony running more than 128gigs
Click to expand...
Click to collapse
I am currently running a 128gb sdxc card, and will be upgrading to a 200 soon. I will report back on how much space I can use.

Sees my 200gb Sandisk card without issue.

OrBy said:
Sees my 200gb Sandisk card without issue.
Click to expand...
Click to collapse
Z3C can handle up to 200GB even though it is only advertised as 128GB, I personally use a 64GB card for I/O Scheduler Reasons

Revontheus said:
Z3C can handle up to 200GB even though it is only advertised as 128GB, I personally use a 64GB card for I/O Scheduler Reasons
Click to expand...
Click to collapse
Which i/o scheduler do you use? Just wondering why there is a limit.

poobucket said:
Which i/o scheduler do you use? Just wondering why there is a limit.
Click to expand...
Click to collapse
If you use SD Cards above 64Gb, Zen/vr/tripndroid are the best choices since they work well with High-Speed Cards. Also At 64 GB if you are using a UHS-3 Card you can set the Read Ahead Cache to around 4096Kb but if not 2048Kb is fine as well... I don't really recommend 200GB Cards since they strain the system, theres probably a reason why the Z3C is only advertised to handle 128GB Cards

Revontheus said:
If you use SD Cards above 64Gb, Zen/vr/tripndroid are the best choices since they work well with High-Speed Cards. Also At 64 GB if you are using a UHS-3 Card you can set the Read Ahead Cache to around 4096Kb but if not 2048Kb is fine as well... I don't really recommend 200GB Cards since they strain the system, theres probably a reason why the Z3C is only advertised to handle 128GB Cards
Click to expand...
Click to collapse
Ah thanks, I did not know this. I set my i/o to tripndroid as I use a 128gb card.

Tripndroid/vr are more performance oriented, Zen is for balanced, daily usage

Revontheus said:
200GB Cards strain the system
Click to expand...
Click to collapse
What? The Linux kernel has no problem handling exabyte block devices. SDXC can handle up to 2 TiB. What part of the system is being strained, and how so? I don't see any reason that any device supporting SDXC would struggle with anything up to 2 TiB.

soldier9599 said:
What? The Linux kernel has no problem handling exabyte block devices. SDXC can handle up to 2 TiB. What part of the system is being strained, and how so? I don't see any reason that any device supporting SDXC would struggle with anything up to 2 TiB.
Click to expand...
Click to collapse
Oh? My apologies...I was just wondering why they won't advertise it as up to 2TB on the specifications sheet. And personally even if there was a 2tb sdxc it would be too expensive and I'd rather buy a portable hdd or something

My old Xperia Play officialy supports only 32GB, however 128GB SD card worked well in it. So I don't think, there is some real limit, but I didn't see larger SD card than 512 GB.

Revontheus said:
Oh? My apologies...I was just wondering why they won't advertise it as up to 2TB on the specifications sheet. And personally even if there was a 2tb sdxc it would be too expensive and I'd rather buy a portable hdd or something
Click to expand...
Click to collapse
No worries, I just wasn't sure if you knew something I didn't. I wouldn't put too much faith in their marketing team. They probably just found the biggest card they thought existed and made sure it worked. Either that or they were afraid "2" would look smaller than a competitor's listing that says "128" to people who have no idea what "GB" or "TB" mean.
I would love to have a 2 TB sd card. That wouldn't come close to holding my entire movie collection, but at least I would be able to fit my entire music collection plus a bunch of movies. I can't even fit half my music on a 200 GB card. Having all my music on my phone would be amazing. I expect 2 TB cards will be around in about five years. It will become affordable just like 200 GB has.

good advices
thanks

soldier9599 said:
What? The Linux kernel has no problem handling exabyte block devices. SDXC can handle up to 2 TiB. What part of the system is being strained, and how so? I don't see any reason that any device supporting SDXC would struggle with anything up to 2 TiB.
Click to expand...
Click to collapse
I was thinking the same. Even though it's obvious, it isn't obvious to everyone (actually, there is only a small minority of the android-users who even know that android uses a linux kernel, even fewer knows what it is).
The system COULD be put under strain though, if you format the micro SD-card in to NTFS. I have an i7 4710MQ laptop. If I write more than 1GB of data on a NTFS-formatted partition the fans run at full strength. Though, I don't see why anyone would use NTFS. Maybe it is formatted as exFAT and there is some strain because of that? FAT32/VFAT has a limit of 8TB, so I don't see why someone would prefer exFAT.

Verbato said:
I was thinking the same. Even though it's obvious, it isn't obvious to everyone (actually, there is only a small minority of the android-users who even know that android uses a linux kernel, even fewer knows what it is).
The system COULD be put under strain though, if you format the micro SD-card in to NTFS. I have an i7 4710MQ laptop. If I write more than 1GB of data on a NTFS-formatted partition the fans run at full strength. Though, I don't see why anyone would use NTFS. Maybe it is formatted as exFAT and there is some strain because of that? FAT32/VFAT has a limit of 8TB, so I don't see why someone would prefer exFAT.
Click to expand...
Click to collapse
Yeah NTFS and Linux don't work great together. The problem with FAT32 is the 4 GiB file size limit which can be a frustrating hindrance since > 4 GiB files are quite common these days. exFAT supports much larger files. Personally I use ext4 on all of my storage. I think it is the best choice if you are predominantly mounting it in Linux.

I use a 200Gb sandisk.

Max SD speed & capacity supported by Huawei P8lite? Different sources confuse me!

Can someone provide some insight about this total mess? I got this Huawei P8lite (or P8 Lite? damn hipster names!) and no idea about what faster and bigger capacity microsd card supports!
Android Pit, CNET, Car Phonehouse and XDA says 128GB.
Ubergizmo says 144 GB (16GB+128GB?)
Notebook Check says the specifications are 32GB, but it worked with a 64GB SDXC card.
Phone Scoop says "up to 32GB".
GSM Arena says it supports 256GB.
256GB can be too much space, but I find convenient to use the phone as some kind of HDD and use some syncing tool (Syncthing, Dropbox) to have all files on all my systems and backup online. I'm worried about those slim microusb connectors, something I need to solve
What's the maximum speed this device is able to support? I'm unable to locate it too? Why isn't specified? How to locate it? Sandisk Xtreme PRO has U3 (UHS 3) and supports reads up to 275MB/s* and writtings up to 100MB/s, for example. Can this mobile support it?

timofonic said:
Can someone provide some insight about this total mess? I got this Huawei P8lite (or P8 Lite? damn hipster names!) and no idea about what faster and bigger capacity microsd card supports!
Android Pit, CNET, Car Phonehouse and XDA says 128GB.
Ubergizmo says 144 GB (16GB+128GB?)
Notebook Check says the specifications are 32GB, but it worked with a 64GB SDXC card.
Phone Scoop says "up to 32GB".
GSM Arena says it supports 256GB.
256GB can be too much space, but I find convenient to use the phone as some kind of HDD and use some syncing tool (Syncthing, Dropbox) to have all files on all my systems and backup online. I'm worried about those slim microusb connectors, something I need to solve
What's the maximum speed this device is able to support? I'm unable to locate it too? Why isn't specified? How to locate it? Sandisk Xtreme PRO has U3 (UHS 3) and supports reads up to 275MB/s* and writtings up to 100MB/s, for example. Can this mobile support it?
Click to expand...
Click to collapse
It can support class 10 and above sdcard(I inserted a slow sdcard so it showed a notification that use class 10 or above sdcard(on emui 3.1) . I think 128 GB the max capacity.

Suleiman01 said:
It can support class 10 and above sdcard(I inserted a slow sdcard so it showed a notification that use class 10 or above sdcard(on emui 3.1) . I think 128 GB the max capacity.
Click to expand...
Click to collapse
Thanks for your input, it's greatly appreciated. What capacity that SD card had?
Yes, it said the same here. I know that's going to be an issue, as I want a massive SD card for different stuff.
Are there someone that casually has big SD cards (128GB+?) and wants to do some tests? What about speed tests?

timofonic said:
Thanks for your input, it's greatly appreciated. What capacity that SD card had?
Yes, it said the same here. I know that's going to be an issue, as I want a massive SD card for different stuff.
Are there someone that casually has big SD cards (128GB+?) and wants to do some tests? What about speed tests?
Click to expand...
Click to collapse
I don't really use that space. I am fine with 16GB class 10 external SD card(the slow one was class 4 8GB). I don't think this phone can handle 128GB sdcard well since it's a midrange phone. However I can ask Huawei care center about this.

@Suleiman01 i think it should, i have the G play/ Honor 4x (same hardware specs than p8 lite, except internal storage, battery and screen size), and it says max support 64gb, but a 128GB sdcard works too

panchovix said:
@Suleiman01 i think it should, i have the G play/ Honor 4x (same hardware specs than p8 lite, except internal storage, battery and screen size), and it says max support 64gb, but a 128GB sdcard works too
Click to expand...
Click to collapse
Then you are right. But it might not be able to handle 128GB+ sdcard. I have emailed Huawei lets see what they say.

Basically it can support all sizes but depends on the file system used. I have a Sony 32GB Class 10 which by default was formatted in FAT32 and i have formatted it to exFAT and it works great on my P8. If the phone supports officially at least 64GB cards then it'll support bigger sized ones because SD cards with capacity of 64GB and up by default come in exFAT file format so this means that it can support higher capacities. Here's the proof
If you are going to buy one then go for the fastest possible or you will have stutters while listening to music and doing some file transfers at the same time. ????

I have a Sandisk 128GB (Obviously formated to FAT32) and works good as hell. All SD cards formatted to FAT32 should work.

pilililo2 said:
I have a Sandisk 128GB (Obviously formated to FAT32) and works good as hell. All SD cards formatted to FAT32 should work.
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What about using EXT4 instead? I use Linux.

Ive never seen a microsd card formatted to ext4. Bigger cards are formatted to exFat which is the formatting that a lot of phones dont support and thats why they say thay they dont support sdcards over xxxGB, but what they actually dont support is exfat. Thats why if you format any size card to FAT32 it will work on any phone regardless of what the manufacturer specifies as the maximum sdcard size. Also ive heard EXT4 is not very nice on flash memories since it wears them out very quickly because of indexing, but I might be going way far here.
Edit: Anyhow linux will support FAT32 so i dont think that makes a problem

@pilililo2
It would be very interesting to know. I know EXT4 provides extensions for SSDs and such since years, but not sure about flash drives (that it seems to use some kind of "HDD emulation in them", right?).
There's this 2010 article about what's the fastest filesystem for cheap flash devices
Arnd Bergmann replied on August 2015 the following in the "ext2 vs ext4 vs exFAT for XO content SD cards?" forum thread:
arnd at arndb.de
Thu Aug 20 16:55:07 EDT 2015
SDXC cards are mandated to be using exFAT (just like SDHC cards have to use VFAT, and indeed this is the only difference between the two) by the SD card standard. If you don't use this, you are strictly speaking
in violation of the standard and the cards might not behave as designed.
In particular, the card is allowed to only do efficient garbage collection for the access patterns that you get with a single exFAT partition that spans the entire card and has all its metadata aligned exactly in the way that the spec defines.
In practice, things tend to work mostly ok with other file systems, but if you use NTFS or ext3 (rather than ext4), you are usually asking for
trouble.
The best longevity would be provided by f2fs, which is designed to work fine on most SD cards. The downside is that it only works on relatively modern Linux kernels (3.x or higher).
I would expect that cards today use only dynamic wear leveling, not static wear leveling as real SSDs do. This means that content on a read-only partition will decay with the normal life of the card (several years, but depending on the quality of the card and the environmental conditions, e.g. not too hot), independent of the presence of partitions you write to.
Dynamic wear leveling works best if you have a lot of unused blocks, so a good strategy for long life would be to leave a whole partition (e.g. 20% of the size of the writable partition, the more you have, the longer the card will survive) that never gets written after manufacturing, or at least gets erased using the fitrim ioctl command after the initial imaging.
For a 128 GB card with 115GB of actual space, you could then use something like:
* 80GB zisofs/cramfs/squashfs for static data
* 30GB f2fs/ext4 for writable data
* 5GB unused space for wear leveling
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You very probably already know that exFAT is totally owned by Microsoft and that there's a leaked GPL-based.exFAT driver for Linux kernel, but this filesystem it's patent encumbered and not merged into mainline.
Why do I mention this?
Because it's a pain in the butt to use it across operating systems and needing to use a custom kernel on your Linux box makes things harder.
I know many custom ROMs with custom kernels use exFAT and very probably even official kernels too, but that's a gray area. Phone manufacturers are able to pay the Microsoft's Android Tax if they want to.

Sooo, what about the bus speed? Is p8 lite compatible with UHC 3 even?