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...

MicroSD Duel: Sandisk Class 10 vs Samsung UHS-1

Hello,
I happen to have 2 fast microSD 64 gigabyte storage cards, and decided to run a benchmark test on each, using my International Galaxy Note II model GT-N7100. I thought there might be some interest on the forum in whether there's any significant performance difference between these cards on our devices.
The two cards are as follows:
- Sandisk Ultra Class 10 64gb microSD
- Samsung UHS-1 64gb microSD
Both cards are empty, and factory-formatted with the exFat file system. Prior to testing on my phone, I mounted each card in a USB 2.0 card reader attached to my Windows 7 laptop and did a full chkdsk with sector scan to verify the storage was as advertised and there were no problems. Both cards scanned as clean with no detectable problems.
My phone is running Android 4.1.1, using Samsung baseband N7100XXALJ2, kernel version 3.0.31-310959, with a build number of JRO03C.N7100XXALJ3.
This phone has never been rooted or flashed with a non-factory ROM.
The benchmarking program I chose to use was "SD Card Tester" version 1.0.5 as downloaded from the Google Play Store.
Each card was tested immediately after rebooting the device and waiting one minute for the system to fully stabilize. Power Saving mode was not active during these tests.
I ran each test 3 times. The results below are the average of the 3 tests per card.
Sandisk Ultra Class 10 (64gb) results:
13.68 MB/s read, 10.26 MB/s write
Samsung UHS-1 (64gb) resuts:
32.8 MB/s read, 14.65 MB/s write
I hope some of you find this information useful. If anyone has questions or suggestions for other ways to compare these storage options, let me know.
Sent from my GT-N7100 using xda premium

interesting..

Samsung :good:

I'm getting different results but with 32gb SanDisk class 10

Thx for that
Sent from my GT-N7100 using xda premium

I was getting worse results with my phone but considering the Sandisk only cost $40 I'm not overly concerned. So long as it doesn't die on me. The Samsung card is like double the price of the Sandisk.

Well, I've got a bit of a disappointing update as I've continued to work with these cards today.
Once you load up these cards with data, a lot of the performance advantage for the Samsung appears to go away.
I now have both of these cards about 33% full (same directories and files on each), and I'm finding no more than 1.5 to 2.5 MB/s measurable difference, either in writing or reading. Although the Samsung has remained the fastest in every test so far, it really isn't much of a difference at this point.
I'd like to understand why the Samsung card appears to suffer more of a performance drop than the Sandisk as the cards fill up, but can't hazard a guess right now.
The small differences I'm now seeing, both in tests as well as normal usage, certainly do nothing to justify the premium price of the Samsung card, IMO.
Sent from my GT-N7100 using xda premium

My results

ronj1986 said:
My results
Click to expand...
Click to collapse
Couple of comments:
1) You need to bump up the size slider to about 2150MB to get a reliable result. As you move the slider, a colored pop-up will turn green when you have reached a size that should yield "excellent" results.
2) Unless you have somehow swapped the internal & external storage cards on your device, your screenshot appears to show the results of testing your internal card rather than your external one.
If 2) is the case, here is a graphic showing how to select your external card (it can be somewhat tricky with this app, especially the "tap" called for in step one - I often have to double-tap rather than single-tap, and it usually doesn't work the first time or two I try it...).
Sent from my GT-N7100 using xda premium

New disappointing results

My 64gb class 10 SanDisk results:

TJCacher said:
Well, I've got a bit of a disappointing update as I've continued to work with these cards today.
Once you load up these cards with data, a lot of the performance advantage for the Samsung appears to go away.
I now have both of these cards about 33% full (same directories and files on each), and I'm finding no more than 1.5 to 2.5 MB/s measurable difference, either in writing or reading. Although the Samsung has remained the fastest in every test so far, it really isn't much of a difference at this point.
I'd like to understand why the Samsung card appears to suffer more of a performance drop than the Sandisk as the cards fill up, but can't hazard a guess right now.
The small differences I'm now seeing, both in tests as well as normal usage, certainly do nothing to justify the premium price of the Samsung card, IMO.
Sent from my GT-N7100 using xda premium
Click to expand...
Click to collapse
Can this be corroborated?

SANDISK Micro SDXC 64 Go
Writing : 17,06 MB/s
Reading : 31,35 MB/s

Karlfox said:
SANDISK Micro SDXC 64 Go
Writing : 17,06 MB/s
Reading : 31,35 MB/s
Click to expand...
Click to collapse
How full is the card

Statement

Every ROM above 2.3.7. is to much for the HD2 leo, I´ve tried many 4 and 4.1 roms (both NAND ans NativeSD) but none of them runs smooth enough.
Scrolling through the homescreens. which is what you see in the most tuorials op YT, is NO guarantee for a smooth working rom.
I´ts strange that I reed so little about this here, only positive experiences....

Maybe there is something wrong with your setup if there are so many positive experiences?

I use a Cyanogen jelly beam ROM daily. Its smooth as it can be and totally reliable. Everything works. All my apps and GPS.
Sent from my HD2 using the power of Jelly Bean

in-call volume for outgoing calls is too loud in every rom beyond GB. That's why it's unusable for me, not the speed or smoothness

but there are many good ics roms !!!! for example the evohd2!!!

7325 said:
but there are many good ics roms !!!! for example the evohd2!!!
Click to expand...
Click to collapse
What could I possebly do wrong then........

Hmmm, found out that my class 10 microSD is a B-brand and not as fast as I thought it would be!
I'm gonna try it again this week and buy a good one.

Genuine Sandisk class 4 or 6 are good for me. No need class 10, it won't help.
There many write-ups here but basically get a good brand name
Sent from my HD2 using the power of Jelly Bean

the hd2 doesn't support class 10. only class 6,4 and 2

hammar63 said:
Hmmm, found out that my class 10 microSD is a B-brand and not as fast as I thought it would be!
I'm gonna try it again this week and buy a good one.
Click to expand...
Click to collapse
Like many already noted - a good brand is more important than a high Class number.
---
With proper diet, rest, and exercise a healthy body will last you a lifetime... (via Tapatalk)

7325 said:
the hd2 doesn't support class 10
Click to expand...
Click to collapse
Yes it does, it's because class ten cards tends to be engineered for large contiguous read/write, (images,video,audio) but many are shockingly slow at small file random read write, which seems to be what native SD relies on most.
In general, a class six will have a better 4k readwrite than a class ten, but it's not as simple as "class six is better", because there are good class tens, you just have to research them.
(same for class four cards,there are some with adequate random rw torun native SD)

samsamuel said:
Yes it does, it's because class ten cards tends to be engineered for large contiguous read/write, (images,video,audio) but many are shockingly slow at small file random read write, which seems to be what native SD relies on most.
In general, a class six will have a better 4k readwrite than a class ten, but it's not as simple as "class six is better", because there are good class tens, you just have to research them.
(same for class four cards,there are some with adequate random rw torun native SD)
Click to expand...
Click to collapse
yes you're right. i mean the hd2 doesn't support the full speed from a class 10 sd card. but he does recongnize the sd card!!!
ps.: a class 10 sd card has a higher read and write speed than a class 6!!!! but older devices (like hd2) support the full speed from a class 6 sd card

7325 said:
ps.: a class 10 sd card has a higher read and write speed than a class 6!!!!
Click to expand...
Click to collapse
You're missing the point, it's nothing to do with the Max speed of the card, or even whether the phone steps it down to a lower class,, it's all about the random read write speed of small blocks, and if you run benchmarks ( or read some benchmark threads) you'll see that most cards, nomatter what class, will only achieve less than 0.1 m/sec at 4k block size. I've seen lots of lists of results for various cards, and loads of cards get way less than 0.1, some as low as 0.01 Megpersecond.

samsamuel said:
You're missing the point, it's nothing to do with the Max speed of the card, or even whether the phone steps it down to a lower class,, it's all about the random read write speed of small blocks, and if you run benchmarks ( or read some benchmark threads) you'll see that most cards, nomatter what class, will only achieve less than 0.1 m/sec at 4k block size. I've seen lots of lists of results for various cards, and loads of cards get way less than 0.1, some as low as 0.01 Megpersecond.
Click to expand...
Click to collapse
Finally someone got it! :thumbup:
---
Don't walk behind me; I may not lead. Don't walk in front of me; I may not follow. Just walk beside me and be my friend. (via Tapatalk)

Native SD (Where is the speed that everyone talking about?)

i have bought a new Sandisk Ultra 16GB class 10 card and flash nexushd2 rom in native sd but i notice no different than nand in the speed !!!
i test the card with h2testw_1.4 and it was ok the speed was 10mb R/W,
So Where is the Speed that everyone talk about !!!!

x_max_best said:
i have bought a new Sandisk Ultra 16GB class 10 card and flash nexushd2 rom in native sd but i notice no different than nand in the speed !!!
i test the card with h2testw_1.4 and it was ok the speed was 10mb R/W,
So Where is the Speed that everyone talk about !!!!
Click to expand...
Click to collapse
That's basically because it's a myth .
I'm kidding, I don't know if it is or not, but personally, I didn't notice any speed difference or improvement. I tried different ROMs, they all behaved as if they were on NAND. I have the same card as you do.
Someone told me once: "It's because you have a UHS card, HD2 doesn't support them so the speed is degraded".
I am not sure of that, but there was no apparent improvement over NAND installation.

+1, I never saw any speed difference. My guess is that since it would theoretically be faster there was a placebo effect and people actually felt their phones being faster. The same thing happens with build.prop tweaks and the entropy seed generator, both of which had great comments but no actual effect on my phone.

x_max_best said:
i have bought a new Sandisk Ultra 16GB class 10 card and flash nexushd2 rom in native sd but i notice no different than nand in the speed !!!
i test the card with h2testw_1.4 and it was ok the speed was 10mb R/W,
So Where is the Speed that everyone talk about !!!!
Click to expand...
Click to collapse
You should read first my friend,this way you will save some Money,any Sandisk class 4 will be faster than any class 10 in native sd, simply because with a class 10 card you get high sequential data transfer and very low random data transfer, and that is the secret random access transfer rate.
But the manufacturers won't tell you the random access speeds, you have to test.
Use crystal disk mark to test the sd and check for the last 2 values..
And read..and search..
Sent from my GT-I9300 using xda premium

x_max_best said:
i have bought a new Sandisk Ultra 16GB class 10 card and flash nexushd2 rom in native sd but i notice no different than nand in the speed !!!
i test the card with h2testw_1.4 and it was ok the speed was 10mb R/W,
So Where is the Speed that everyone talk about !!!!
Click to expand...
Click to collapse
I can confirm that the problem is with the Sandisk Ultra SD Card. I had good read but very poor write speeds on a Sandisk UHC which caused all sorts of problems. I changed to a Samsung Class 10 32Gb card and the difference is very noticeable The Sandisk gave a write speed of about 3/4 Mbs and a read speed of about 15 Mbs. The Samsung now gives a write speed of 9.7 and a read speed of 20.15. Both tested with a cache size of 2048Kb.

sandymac said:
I can confirm that the problem is with the Sandisk Ultra SD Card. I had good read but very poor write speeds on a Sandisk UHC which caused all sorts of problems. I changed to a Samsung Class 10 32Gb card and the difference is very noticeable The Sandisk gave a write speed of about 3/4 Mbs and a read speed of about 15 Mbs. The Samsung now gives a write speed of 9.7 and a read speed of 20.15. Both tested with a cache size of 2048Kb.
Click to expand...
Click to collapse
I had the same low write speed in native SD (3 mb), but i flash the rom again in DataonExt mod and the speed of write was 7 mb and i feel some speed up in apps (not in the rom) Rom toolbox collect data faster , I think there is something wroung with Native SD ,the speed of write should be higher than 3mb
Edit: it was a placebo effect , there is no speed up in DataonExt , i test the same app in Nand

x_max_best said:
I had the same low write speed in native SD (3 mb), but i flash the rom again in DataonExt mod and the speed of write was 7 mb and i feel some speed up in apps (not in the rom) Rom toolbox collect data faster , I think there is something wroung with Native SD ,the speed of write should be higher than 3mb
Click to expand...
Click to collapse
Well, if you looked, I am on Native SD and generally manage around the 10Mbs write with 20Mbs read so nothing wrong with Native SD.

as the creators of nativeSD and others have pointed out, it's all down to the small block size random read/write speed, that's what most read/writes are when running an OS, small and random.
While reading (for example) a video, it will read bigger, almost certainly sequential, block sizes.
The industry quoted max speed of a card is almost always based on the largest block size, usually read, always sequential speed, so a class 10 can read large block sizes at 10meg, however, test the card for all different block sizes and you'll see that small random r/w's are wayyyyy slower, massively so, often on the order of a factor of 1000 slower.
In general, the lower class cards actually beat the class 10s, often by a large factor, so the rom running from it feels snappier and more responsive than on a class 10.
Check out the (admittedly over a year old, but still a good example) comparison charts HERE, and note especially the 4th and 5th charts, where the class 4 blows the others down by over a factor of 100
http://www.tomshardware.com/reviews/microsdhc-memory-card-performance,3011-12.html

samsamuel said:
as the creators of nativeSD and others have pointed out, it's all down to the small block size random read/write speed, that's what most read/writes are when running an OS, small and random.
While reading (for example) a video, it will read bigger, almost certainly sequential, block sizes.
The industry quoted max speed of a card is almost always based on the largest block size, usually read, always sequential speed, so a class 10 can read large block sizes at 10meg, however, test the card for all different block sizes and you'll see that small random r/w's are wayyyyy slower, massively so, often on the order of a factor of 1000 slower.
In general, the lower class cards actually beat the class 10s, often by a large factor, so the rom running from it feels snappier and more responsive than on a class 10.
Check out the (admittedly over a year old, but still a good example) comparison charts HERE, and note especially the 4th and 5th charts, where the class 4 blows the others down by over a factor of 100
http://www.tomshardware.com/reviews/microsdhc-memory-card-performance,3011-12.html
Click to expand...
Click to collapse
yugoport said:
You should read first my friend,this way you will save some Money,any Sandisk class 4 will be faster than any class 10 in native sd, simply because with a class 10 card you get high sequential data transfer and very low random data transfer, and that is the secret random access transfer rate.
But the manufacturers won't tell you the random access speeds, you have to test.
Use crystal disk mark to test the sd and check for the last 2 values..
And read..and search..
Sent from my GT-I9300 using xda premium
Click to expand...
Click to collapse
This is crystal disk mark for my SD Card , See it and tell me where exactly the problem !!

x_max_best said:
This is crystal disk mark for my SD Card , See it and tell me where exactly the problem !!
Click to expand...
Click to collapse
Look at my scandisk class 2 32 gb below, in the last field at right is basically more than 30 times faster than yours in the random write..
https://www.dropbox.com/s/bgbm6tcv99a1r7j/scandisk class 2 32 gb.JPG

This is crystal disk mark for my SD Card , See it and tell me where exactly the problem !!
Click to expand...
Click to collapse
The random write speed is to low! Look by "write 4k" and "write 4k/QD32".
Look here, the second ranking is importand for us:
http://forums.whirlpool.net.au/forum-replies.cfm?t=1582172
And here from XDA:
http://forum.xda-developers.com/showthread.php?t=1150369

x_max_best said:
This is crystal disk mark for my SD Card , See it and tell me where exactly the problem !!
Click to expand...
Click to collapse
as already noted 4k and 4kqd32 (qd32 = there are 32 or more write operations in the queue, probably quite common when running an operating system) speeds are atrocious, thats gonna be your real speed, more often than not, somewhere between 38K/sec and 0.6MB/sec,,, a world away from 10MB/sec. Course, oftentimes the system is reading those small blocks, not writing, which is faster so you can probably make a rough estimate of total average r/w at around 2MB/sec, still a long way from 10MB/sec

yugoport said:
Look at my scandisk class 2 32 gb below, in the last field at right is basically more than 30 times faster than yours in the random write..
https://www.dropbox.com/s/bgbm6tcv99a1r7j/scandisk class 2 32 gb.JPG
Click to expand...
Click to collapse
Fietz said:
The random write speed is to low! Look by "write 4k" and "write 4k/QD32".
Look here, the second ranking is importand for us:
http://forums.whirlpool.net.au/forum-replies.cfm?t=1582172
And here from XDA:
http://forum.xda-developers.com/showthread.php?t=1150369
Click to expand...
Click to collapse
Your Conclusion is wroung , i retest my card with CrystalDiskMark and the result was interesting (attachment) ,and all i did to get this result is change the test size to 50 mb , i start to believe that there is noting called fast Native SD , it is just placebo effect.
if you want me to believe u ,provide a video in Youtube for the fast Native SD that u have and let me know what do u mean by fast Native SD

x_max_best said:
Your Conclusion is wroung , i retest my card with CrystalDiskMark and the result was interesting (attachment) ,and all i did to get this result is change the test size to 50 mb , i start to believe that there is noting called fast Native SD , it is just placebo effect.
if you want me to believe u ,provide a video in Youtube for the fast Native SD that u have and let me know what do u mean by fast Native SD
Click to expand...
Click to collapse
I don't need to prove anything..if you think it's not fast or it doesn't suits you use nand.. I have more important things to do..
Sent from my GT-I9300 using xda premium

SD Card is So Freaking Slow!

I have a PNY U3 Turbo Performance 64GB High Speed MicroSDXC Class 10 UHS-I, up to 90MB/sec Flash Card. It seems to get slower with time. I mean it is literally taking me like 60 seconds to delete a few pictures. The card is formatted to portable storage. I only store music and photos on it. Reformatting offered no improvement. It is borderline unusable.
So, I benchmarked and found that my read speed is about 59 mb per sec and my write speed is 4.4 mb per sec. I can live with the read speed but the write speed is horrible. What gives?

How many pictures are you talking about, and how large are they?

128KB clusters?
I found trying to use 4K clusters in exfat was resulting in the same slowness. Reformatted to 128KB clusters and it flys (~20MB/s write ~70MB/read). Sandisk ultra plus 64GB.

I have this issue as well I have one of the fast Samsung cards. First few months worked great super fast but now takes a while to carry over a gig of pics and music. I also notice lag in loading and delteing photos through the phone

These are normal pics 5-6 MB. There has to be something wrong.

Irieone said:
These are normal pics 5-6 MB. There has to be something wrong.
Click to expand...
Click to collapse
If you find any info/solution let us know.
Im thinking about running it through one of the tests that show the read/write speed, if its not up to par on that I will contact samsung see if its covered under their warranty.

Why not opt for a 128GB sd card? My Moto X Pure will be here Thursday. I have a 64GB in my old phone but I may get 128.

Has the OP tried backing up their data and reformatting the card?

gpz1100 said:
Has the OP tried backing up their data and reformatting the card?
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Yes, I have tried this a few times and it did not help. The write speed of this particular card is somewhere between 5 and 9 mb/sec. I have used multiple benchmarking tools that all confirm the same thing. The sad thing, if you drill down into the specifications for a lot of these new sd cards there is no mention of write- speeds. I asked a question similar to my OP on Reddit and had somebody with the same card echo my issue. Terrible write speeds. I am not in the mood to buy another card with great specs only to find it performs poorly in my phone? There is still a part of me that thinks it's hardware or software related and specific to the phone. I can't quite believe that something advertised as "turbo", UHS-1, Class 10, and 90 mb/sec has an actual write speed of 5 mb/sec. It seems criminal.

^^See my post #3. I've found this card to have very good write speeds on the phone of ~14-16 MB/s, reads around 40-50. On the pc through a usb 3 card reader I can write at the speeds posted above.
But yes, unless you drill down, the marketing and advertising doesn't list write speeds. I can see why. It all depends where you'll be using it. I'll be lucky to see sustained 10MB/s read through my dash cam (not sure what the write speed even is) even through the card is capable of 40MB/s +.
I should say, using the moto x, through MTP, I've seen read speeds upwards of 35-40MB/s, write speeds of about 7-10MB. The card is faster through twrp, backup stats indicate ~14-16MB/s.

http://forum.xda-developers.com/moto-x-style/general/micro-sd-speed-chart-t3196020