Related
Hi,
if you have the Huawei U8800 Pro (alias Ideos X5 Pro or U8800+) please try if your smartphone is affected by the sdcard mount bug.
Be sure that you have disabled the "Fast boot" on Settings->Applications->Fast boot (needs to be unchecked).
Then shutdown your U8800Pro and powen on.
Question: Is your sdcard (the external one microsd) correctly mounted? Can you see its content?
If you want your smartphone reads again your sdcard, you need to Reboot and magically Android mounts correctly your external microsd.
Please vote the poll upon this thread!
Regards,
kalo86
While it's unlikely I'll be able to help (the kernel patches I've written in the past have been basic), you should run "dmesg" right after it happens and paste the log here
Thanks qwerty12,
I'm going to post the result.
Be right back,
regards
This is the output of "dmesg": http://pastebin.com/GBWnecwJ
Please try more than one time because the bug is not "regular", it is a sort of random.
But in most cases, about 90%, every power on (after a full shutdown) the external sdcard is not correctly mounted and sometimes Android adverts me in the status bar that the file system is unknown.
Regards
I have 3 different microsd cards:
- Transcend 1GB (no class on the sdcard but > 4);
- Sandisk 4GB class 2;
- Sandisk 16GB class 4.
I have this bug with Sandisk sdcards and NOT with the Transcend one.
I am understanding that our Huawei U8800 Pro wants fast sdcards and my theory is confirmed by several tests.
The Transcend sdcard is the most fast among my sdcards (anyway I don't know the class because it's now written on the sdcard) and I proved its performance with a benchmark software. Its performance are better than Sandisk class 4, then its class is maybe 6.
Regards
Maybe a solution?
Hello dear Forum users,
I finally tried a new way for fixing the sdcard mounting problem.
I am used to format sdcard or any king of external drive with the built in format-tool of Windows 7 x64.
Anyway today I tried a new format tool (of course a new format tool for me ), developed by Panasonic, this is the download link:
https://www.sdcard.org/downloads/formatter_3/sdfmt3_1.zip
I formatted my sdcard with this software and magically the external sdcard is always correctly mounted!
Hoping to help other user,
best regards,
kalo86
Too good to be true i tried this method, has no effect at all..i have tried 2 different cards, class 4 and 6, i guess this bug lives in base huawei 2.3 code.. lets wait for new release from Huawei next week and hope this issue to be fixed.
kalo86 said:
Hello dear Forum users,
I finally tried a new way for fixing the sdcard mounting problem.
I am used to format sdcard or any king of external drive with the built in format-tool of Windows 7 x64.
Anyway today I tried a new format tool (of course a new format tool for me ), developed by Panasonic, this is the download link:
https://www.sdcard.org/downloads/formatter_3/sdfmt3_1.zip
I formatted my sdcard with this software and magically the external sdcard is always correctly mounted!
Hoping to help other user,
best regards,
kalo86
Click to expand...
Click to collapse
Oh, I'm very sorry to hear this
Anyway I changed something on the init.rc file (on the ramdisk of the kernel), so I don't know if the solution is a combination of the init.rc and sd-format tool. What I know is that my combination solved my drastic problem. Watching the status of the poll I have to say that there is for sure a problem on the huawei 2.3.5 base, yes, you're right.
If you want you can try my boot.img, based on genokolar kernel but I deleted lots of script, it's very "light" and like the stock one, except for the root rights.
Moved To Q&A
We now have a Q&A section. Please post all questions there
Download any Linux distribution and open a virtual terminal or terminal. Then do next things on bash:
1. Log in as root with su program by typing "su" and give root password (check distributor help page what is root in Live mode if using such).
2. Use dmesg and tail programs to get device information by typing
"dmesg | tail"
3. Physically connect your MicroSD card to reader
4. Re-use dmesg and tail programs to get device information of connected MicroSD by typing
"dmesg | tail"
5. Read what device was connected (Example /dev/sdb (! Not /dev/sdb1 or anything else number, just /dev/sdX)) from the output what dmesg program gave you when connected the MicroSD card
6. Overwrite whole card with full of zeroes with dd program and zero generator by typing
"dd if=/dev/zero of=/dev/sdX"
!!! IT WILL DESTROY ALL DATA ON CARD AND PARTITION TABLE !!!
and just wait that dd program write the whole card full of zeroes. of= means "Output File" and if= means "Input File". Be very careful that you have correct MicroSD card targeted (of=).
7. After you have cleared the whole card, eject it from card reader and re-insert it.
8. Re-use dmesg and tail programs to confirm the same device file is used
9. use fdisk program to create a new partitions and partition table to the card by typing
"fdisk /dev/sdX"
and press m for help. You need to create a new primary partition (n) and then write it to disk and quit (w). You can print already existing partitions with p as Print.
10. Eject the card and re-insert it
11. Use again dmesg and tail program to confirm new device files and partitions (Example, now there should be /dev/sdb, /dev/sdb1 if created one partition)
12. Generate a filesystem on created partitions and write them to partition table with filesystem tools (fat32 filesystem usually is wanted) by using mkfs.vfat program.
Type "mkfs.vfat /dev/sdX1"
13. Eject and re-insert the card
It should now be working again, with FAT32 partition on it.
P.S You can skip 7-13 parts if you want to do partitions on Windows, I always do it on Unix because Windows might get things still wrong but after the partition table is re-created on Unix, it works on Windows as well.
I have fixed dozens of "broken" cards and sticks by this way.
If you can not get your card listed with dmesg program then that card is physically broken, NAND chip is gone gaga or your card reader is broken as computer does not even recognize the card at all.
Hi Fri13,
Thank you for your post but I have to say that my sdcard (the latest one) was a new one and I bought a new sdcard because I thought that my previous sdcard was broken.
A new sdcard cannot get the same problem.
This is a bug!
Hi
I was gonne try formatting the SD card with the program you recommended and changing the boot.img. But if i use youre boot.img does that mean i cant use a custom ROM? Just before i got the problem i was thinking about using one.... Now to the formatting program xD it is 3 options i can choose between in the program which one is the one that im supposed to use? i can choose between: Quick, Full (Erase) and Full (Overwrite). Which one is it?
theminikiller said:
Hi
I was gonne try formatting the SD card with the program you recommended and changing the boot.img. But if i use youre boot.img does that mean i cant use a custom ROM? Just before i got the problem i was thinking about using one.... Now to the formatting program xD it is 3 options i can choose between in the program which one is the one that im supposed to use? i can choose between: Quick, Full (Erase) and Full (Overwrite). Which one is it?
Click to expand...
Click to collapse
Hi theminikiller,
If I'm not wrong you have the U8800 which has a different boot.img (kernel of U8800 pro version).
Then you can only try formatting the external sdcard.
Open SDFormatter;
Click on Option;
Format type ---> Quick
Format Size Adjustment ---> ON
I used these settings.
Regards,
kalo86
I tryed to format my sd-card but after i formatted it, copyed back everything i had on it and put it back in my phone it tells me up in the notification bar that the SD-card is damaged. Shouldnt i have copyed back the things i had on it before? or was it something else that went wrong?
Alright folks, you asked for it and here's a simple how-to that will guide you to create and enable a swap partition on external micro-sd on our SGS.
First things first I assume you have already flashed the kernel Devil2_0.73_swap_i9000_CFS_BLN_CMC_20120420 or any other kernel which supports swap partition.
First thing, you want to partition your SD card in order to create our swap partition, I recommend you to follow this accurately.
If you are on mac you can use iPartition to partition your sd-card, while linux users can use Gparted or any other partition tool they may like.
Now that we have successfully created our swap partition, we want to boot up the phone and enable our swap partition in order to be accessible to the kernel.
To detect the swap partition that we have just created open up a ADB terminal and type
Code:
fdisk -l dev/block/mmcblk1
it will look something like this
Code:
/dev/block/mmcblk1p2 1861 1924 514080 82 Linux swap
write down the exact number of the swap partition and let's activate it by typing
Code:
swapon /dev/block/mmcblk1pX
** where X is the number of the swap partition **
We can now check if our swap partition has been activated by executing the command free
Now we want to make our swap partition to be activated at boot time, without having to activate it manually everytime we reboot the phone.
Assuming you know how to at least write and save a text file in VI, let's go back to our fido ADB shell and type
Code:
vi /system/etc/init.d/05userinit
now lets drop few lines in
Code:
#Activate swap at boot
#!/system/bin/sh
swapon -a
If you are not really comfortable with VI you can also use Nano or even RootExploer or any other root editor if you are more comfortable with UI.
save it and once again in ADB shell lets make it executable
Code:
chmod 750 /system/etc/init.d/05userinit
Now lets create a fstab file so that the kernel can look at and activate the correct swap partition
Code:
vi /system/etc/fstab
Here it goes our swap partition. Remember where X is your actual swap partition according to your partition layout.
Code:
/dev/block/mmcblk1pX swap swap
As last step you may want to change the swappiness value. Note that most of the roms have it set to 60 by default, which is good enough in my opinion, although setting it to higher (max is 100) may help to improve overall performance, while setting it to lower may increase interactivity and overall stability.
Temporary change (until next reboot)
Code:
echo 60 > /proc/sys/vm/swappiness
Permanent change
Code:
echo vm.swappiness=60 >> /system/etc/sysctl.conf
As result
Code:
[email protected]:/ # free
total used free shared buffers
Mem: 385772 376352 9420 0 26420
-/+ buffers: 349932 35840
Swap: 514076 0 514076
** few notes **
I don't intend to take credit for this how-to as it takes few pieces of commands and hints from any guides out there which covers this topic, and anyways its basic linux knowledge really..
/** A special shout goes out to @DerTeufel1980 for listening to our request and enabling swap on his kernel. **/
So cheers you all and enjoy
You never know...
Thanks for great guide!!
Thx for this great guide.
Will try it out soon.
is it possible to make swap on internal flash storage ?
omyg said:
is it possible to make swap on internal flash storage ?
Click to expand...
Click to collapse
Maybe, but most external sd cards are faster. And it's saver.
Where can we find Devil2 73 please?
Envoyé depuis mon Amazon Kindle Fire avec Tapatalk
http://forum.xda-developers.com/showthread.php?p=25085260
Sent from my GT-I9000 using Tapatalk 2
it must be said that the card such use may come into disrepair faster
dark_knight35 said:
Thx for this great guide.
Will try it out soon.
Click to expand...
Click to collapse
Thank you all.. Your feedback is really important to me .
This guide has been tested on ICSSGS RC 4.2 with kernel Devil2_0.73_swap_i9000_CFS_BLN_CMC_20120420 . However it should just work fine on every roms and kernels which supports swap and do not mess with init.d.
omyg said:
is it possible to make swap on internal flash storage ?
Click to expand...
Click to collapse
Yes it is, but it wont worth to use ur nand as swap as the function of the swap is to read and write cpu data, and its usually very aggressive.
Yes it is faster, but it will most likely going to damage the nand, while using a sd-card is usually slower but the worst scenario is that u will have to trash your sd-card after a couple of years, not the phone..
Great Guide! Quite detailed
So, did you notice any heavy good change using SWAP?
Or is it just noticeable?
And what about Multitasking?
swap for sgs... great i watin for roms with this . dont forget about power ow swap
gokussjx said:
Great Guide! Quite detailed
So, did you notice any heavy good change using SWAP?
Or is it just noticeable?
And what about Multitasking?
Click to expand...
Click to collapse
Thank your for the feedback. However I can say I have suddenly noticed a speed bost in the way the phone response, especially whit multiple applications open and services running in background. Till yesterday without swap I had to close like some apps each 4/5 opened and left in background. Right now I am playing GTA and I have like 8 apps opened in background.
Segnale007 said:
Thank your for the feedback. However I can say I have suddenly noticed a speed bost in the way the phone response, especially whit multiple applications open and services running in background. Till yesterday without swap I had to close like some apps each 4/5 opened and left in background. Right now I am playing GTA and I have like 8 apps opened in background.
Click to expand...
Click to collapse
How big is your swap partition?
Looking forward to getting a new micro sd to also feel the speed.
Now I use 512 mb swap on 10 class sd-card partitioned and set up by this guide. Works well. Feels like much better than with swapper2. Thanks
lerkin said:
Now I use 512 mb swap on 10 class sd-card partitioned and set up by this guide. Works well. Feels like much better than with swapper2. Thanks
Click to expand...
Click to collapse
What's the name of your sd card? I want to buy a new one, because I only have class 2 atm.
dark_knight35 said:
What's the name of your sd card? I want to buy a new one, because I only have class 2 atm.
Click to expand...
Click to collapse
It's a cheep Silicon powder)
Sent from my GT-I9000 using Tapatalk 2
lerkin said:
It's a cheep Silicon powder)
Sent from my GT-I9000 using Tapatalk 2
Click to expand...
Click to collapse
Thx. I'm gonna buy this xD.
lerkin said:
Now I use 512 mb swap on 10 class sd-card partitioned and set up by this guide. Works well. Feels like much better than with swapper2. Thanks
Click to expand...
Click to collapse
My pleasure
I was setting up and noticed an issue with my S4's internal memory. It is stating the standard 8.82 gigs of space, but only shows 2.77 gigs available. Total in use is is as follows:
Apps: 1.25 GB
Pics : 359 MB
Audio: 435 MB
Downloads: 30 MB
Misc: 315 MB
Available: 2.77 GB
The available bar is a huge bar at the top, so the bar is showing that it should have closer to 5 gigs than 3, but the phone itself is only recognizing 2.77 available. I attached a screenshot of what I am seeing, it's got me confused. I tried googling and looking through here, but there's about 1,000,000 links about the whole "I only have 8.82 gigs on my 16 GB device" which makes trying to find a different memory issue hard.
Any ideas on what could be causing this and a possible fix action?
SirBayard said:
I was setting up and noticed an issue with my S4's internal memory. It is stating the standard 8.82 gigs of space, but only shows 2.77 gigs available. Total in use is is as follows:
Apps: 1.25 GB
Pics : 359 MB
Audio: 435 MB
Downloads: 30 MB
Misc: 315 MB
Available: 2.77 GB
The available bar is a huge bar at the top, so the bar is showing that it should have closer to 5 gigs than 3, but the phone itself is only recognizing 2.77 available. I attached a screenshot of what I am seeing, it's got me confused. I tried googling and looking through here, but there's about 1,000,000 links about the whole "I only have 8.82 gigs on my 16 GB device" which makes trying to find a different memory issue hard.
Any ideas on what could be causing this and a possible fix action?
Click to expand...
Click to collapse
mine shows:
total:9,15GB
Apps: 1,41GB
Pics,Vids:0,92GB
Audio:168kb
Downloads: 6,52MB
Misc: 130MB
Avail: 7,19GB
what ROM do you have?
SirBayard said:
I was setting up and noticed an issue with my S4's internal memory. It is stating the standard 8.82 gigs of space, but only shows 2.77 gigs available. Total in use is is as follows:
Apps: 1.25 GB
Pics : 359 MB
Audio: 435 MB
Downloads: 30 MB
Misc: 315 MB
Available: 2.77 GB
The available bar is a huge bar at the top, so the bar is showing that it should have closer to 5 gigs than 3, but the phone itself is only recognizing 2.77 available. I attached a screenshot of what I am seeing, it's got me confused. I tried googling and looking through here, but there's about 1,000,000 links about the whole "I only have 8.82 gigs on my 16 GB device" which makes trying to find a different memory issue hard.
Any ideas on what could be causing this and a possible fix action?
Click to expand...
Click to collapse
Try to clear the cache of all your apps specially the browsers.
I'm still running the stock firmware (XXUAMDK), rooted. I wiped the cache and am sitting at 2.79 instead of 2.77. My girlfriend's S4 is setup the same way as mine, same firmware and rooted the same way, and is showing 8 gigs available.
SirBayard said:
I'm still running the stock firmware (XXUAMDK), rooted. I wiped the cache and am sitting at 2.79 instead of 2.77. My girlfriend's S4 is setup the same way as mine, same firmware and rooted the same way, and is showing 8 gigs available.
Click to expand...
Click to collapse
Reflash stock rom again or do factory reset
I have the same problem, I have rooted then flashed CM unto my S4 but reverted to stock since i liked the sensors
No however i lost storage capacity. I have a grand total of 9.15 GB i can access... I have 504 MB in programs; 76 KB in the rest and a wooping 4.81 GB free... this is after i used KIES to flas stock and i have also tried factory reset and a formation in CWM recovery.
qazmed said:
Reflash stock rom again or do factory reset
Click to expand...
Click to collapse
I was afraid that might be the solution. girlfriend's getting upset at me tinkering with my gadgets all the time, haha. Did a factory rest, no luck. Will attempt a reflash of the stock ROM tonight and report back. if it doesn't work I might try a custom ROM just to test and try and get more data.
Solved
I reflashed the stock firmware and had no luck, so I went into the extremes, booted into CWM and went to Mounts and Storage and just started formatting everything, starting with the storage card. Now showing the proper storage space. While searching for how to format my Internal storage to see if it would help, I also stumbled upon this:
http://forum.xda-developers.com/showthread.php?t=2274218
Specifically:
Because the Settings > Storage > sdcard shows the space free and used for /data as "sdcard" but only looks in /data/app, /data/data and /data/media/0 to get the breakdown of what is using the space, you will find that anything just in /data/media will show aup s used space, but the breakdown of apps, pictures, media etc will not show these files so it appears that they do not add up.
Example...
You have:
1 GB apps
1 GB Pictures and Video
4 GB Nandroid (Misc) - but this is in wrong place /data/media
Used space will show 6 GB
But breakdown will show
1 GB apps
1 GB Pictures and Video
0 GB Misc
So it looks like you lost 4 GB. It's a good idea to check /data/media every now and again to ensure nothing goes there by accident.
Click to expand...
Click to collapse
Which seems to also relate to the exact issue I was having, so I guess just using the search terms I was using wasn't working. I had already formatted my card before I checked to see if it was an issue with my nandroid backups being stored in the wrong place, though, so can't confirm for sure that was the issue, but it seems to describe it perfectly.
Thanks for the ideas and the assists in the matter, though, and hopefully if someone else comes to the S4 forums specifically with this problem it can help.
Hello everyone,
I put my questions in bold so they're easier to find and address, I'm not trying to shout.
So, I'm getting ready to create a rom slot using Safestrap but when trying to free up memory for a new slot, I'm having trouble understanding where some of my memory went.
I opened up the application manager to view the usage and it shows I have 5.42 GB of space available (see Phone Memory attachment).
This seems to be consistent as when viewing the available memory in windows, it shows I have 5.41 GB of 9.61 GB free (see PC Memory Analysis attachment).
So the first question is where did 6.39 GB of my 16 GB device go to get down to only 9.61 GB left (I can only assume Android's OS)?
I went into explorer to find out what's taking up all the space and what I can remove but when I set my computer to read all hidden files, selected all the folders and then click properties, it can only seem to find 1.5GB of data on there rather than the 4.2 GB (9.61GB total - 5.41GB left over - 1.5 GB found on the folder) it says I'm using (see Explorer Analysis).
Any idea what happened to this 2.7 GB or so of data?
Also, does anyone know the minimum space I should reserve on the internal memory for the phone to operate or is that already considered in the 7 GB or so of Android data? I know when you run out of disk space on the OS partition of a hard drive, you see a significant speed decrease and I want to make sure I don't do the same on my phone. If I can fully fill up the disk space without any performance decrease, that works too.
Thanks, everyone!
Anyway Galaxy Tab S2 can read and write file more than 4GB in the SD Card ?
I have no problem with the internal storage....
thanks
Format to exFAT.
ashyx said:
Format to exFAT.
Click to expand...
Click to collapse
and plug into s2 and it can read ?
Of course.
Sent from my HTC One_M8 using XDA Free mobile app
ashyx said:
Of course.
Oh ya... thanks Ashyx... it works.. this didn't work in old phone...
Click to expand...
Click to collapse
localbus said:
ashyx said:
Of course.
Oh ya... thanks Ashyx... it works.. this didn't work in old phone...
Click to expand...
Click to collapse
Modern devices
Click to expand...
Click to collapse
ashyx said:
Of course.
Sent from my HTC One_M8 using XDA Free mobile app
Click to expand...
Click to collapse
how can you reformat the sd card to exfat?
Phurkus said:
how can you reformat the sd card to exfat?
Click to expand...
Click to collapse
Windows, twrp or app.
I've always been under the impression that it's preferable to format cards to FAT32 as long as the file size limit isn't an issue. I imagine that the benefit wouldn't be terribly significant, but I'm in the habit of reformatting new cards to FAT32 due to my impression that there's at least some benefit towards performance (I use FolderMount heavily, mostly for huge games and I've never noticed decreased performance from keeping the obb files on external storage).
I'd be curious to hear your take @ashyx in any case, but I actually just got a new 128 GB card yesterday that I was opening up to reformat it with GParted when I read this post :laugh: I've been debating setting up a MultiSystem setup on my Note 4 (I'd actually prefer to use my S2 for that... All of the listed "supported devices" happen to be the variants with Qualcomm chips. Another element that they share is that they are all supported by ROMs other than stock... So I suppose that my 817T is "less than ideal" for that purpose!) I think I'm going to include a small ext4 partition anyway in case I do end up using my phone to multiboot. It's pretty likely that I will at some point, and having the partition scheme set up already and just swapping cards sure beats adding a partition to a populated disk... Here's the MultiSystem thread in case you're not familiar. Looks like an awesome tool... http://forum.xda-developers.com/android/software-hacking/tool-multirom-recovery-replacement-t3102395
@Phurkus Most cards come already formatted as exfat, at least those on the higher end of the storage spectrum. If you need to reformat it depends which OS you're using. Windows supports exfat natively, so all you need to do is right click on the disk, select "format", then just make sure that the dialog box that pops up has exfat selected (it should, NTFS is the only other option), you can leave "quick format" checked, type in a name if you want, then just hit start. If you want to format a filesystem to FAT32 though, there are a few small free utilities that you can use. The only one I've used myself is called Rufus. This isn't really necessary for formatting an entire device to a single partition of a common filesystem type, but I almost always use a Linux system for disk partitioning. The tools available are (generally) far more powerful, but the learning curve is a bit steeper depending on how/what you're doing and there can be a greater risk of data loss if your disk isn't blank (or if you're spacing out and wipe a local partition need for your OS installation)! Anyway, the free Windows utilities are just fine for simply reformatting a disk
Phurkus said:
how can you reformat the sd card to exfat?
Click to expand...
Click to collapse
READ THIS REPLY FULLY, THEN DO YOUR FORMATTING AS POSTED IN THE MIDDLE SECTION OF THIS POST.
Windows 7,
Click Start
In the search type in "CMD" (without quotes)
In the results, top of search window, CMD will appear Don't click enter...right click CMD and "Run as administrator ". CMD window opens (black background).
Type:
diskpart (hit enter)
List disk (hit enter)
...you will now see a list of hard drives, thumb drives, and memory cards in this result of list disk . Pay attention to the size of the sd card your working with. Results may be...
Disk 0 500 GB. (PC hard drive)
Disk 1 64 GB (64 GB micro SD card)
500 might show 480 something.. same with 64 showing 58.. you got the idea.
The disk 0 will be your 500 GB hard drive for the PC. You will NOT chose disk 0.
This above is an example. The size I said is an example. It is easy to do. Dont get scared
Again,
diskpart ( hit enter )
List disk ( hit enter )
Select disc 1 ( if one is your sd card, from example above )
clean ( hit enter, time to wait you won't be able to type a letter if PC is still doing this ' work' just wait / for a deep clean you can type ' clean all ' (longer, like an hr )
create partition primary /or.. creat part prim ( hit enter )
active ( hit enter )
format quick fs=exfat ( hit enter ) (this is your type of format, exfat or you can fat32 or.. if you want a In depth format type ' format fs=exfat ' notice 'quick' was removed.
exit ( hit enter )
exit ( hit enter )
You can now remove the sd card from PC and put in your device. It is now erased and formatted to exFAT.
-------------
ONCE AGAIN,
CMD right click run as administrator, important to be admin.
diskpart
list disk
select disk #
clean
creat prim part
active
format fs=exfat
exit
exit
EXACTLY AS I HAVE TYPED.
You can
format quick fs=exfat
Diskpart is a program to do work on disks.
list disk is listing disks connected to the PC.
select disk, is chosing a disk to only work on in this diskpart program.
clean, is erasing get the disk and cleaning it.
creat prim part ( short for create primary partition) making the disk a partition for primary use. Since no specific custom size was typed, the whole disk is being marked as a primary partition.
active, is activating the disk (personally don't know if NEEDED but I think it can be a key factor to make it work. I'm just posting what I read from a master)
format fs=exfat, is formatting get the disk to exFAT. You can chose .. format fs=fat32 if you want FAT32 format.
exit, is exiting the diskpart
exit is exiting the CMD.
Dont add or miss spaces in the commands.
When choosing a mistake disk like the windows 7 main disk, it won't work. Your using Windows and running CMD from the Windows folder , since the PC is not going to erase itself you will probably get an error . IF you chose another none Windows Disk, it will work and erase and format that chosen disk. Chose carefully.
If all fails ( hard to mess up if you simply follow my directions ) just type exit to exit diskpart, and exit again out of CMD.
It is real simple and it is the way to erase, activate and format a sd card / micro SD card. I just did this on mine yesterday.
-------
MICRO SD CARD SPEEDS ON SAMSUNG GALAXY TAB S2......
As far as speeds go, my Samsung PRO+ 32 GB micro SD card class 10, U3, UHS-I is showing get speeds of:
Read 60
Write 30
Read 63
Write 35
Tests done on an empty card at home.
With the card used, 15 GB left, I'm showing, my results were
Read 61
Write 26.
Keep in mind my WiFi is cable, @ 60 down 7 up.
In BestBuy
I got
Read 60
Write 47
When I was in best buy complaining to Samsung, using there WiFi.
I bought a 64 GB micro SD card SanDisk ULTRA Plus, class 10, U1, UHS-I
The format out the box was, ( exFAT with a 16mb unallocated partition on the 64GB micro SD card.)
16mb of the space was not formatted and separate from the rest of the size. I'm not sure why? For self device cache? For ' alignment '?
I formatted using the above method. The entire space is now exFAT.
The card SanDisk ULTRA PLUS, came with exFAT format being 64gb.. the Samsung PRO+ 32GB was FAT32.
Results of the SanDisk ULTRA PLUS is,
Read 55
Write 15-18
The Samsung PRO+ is a Read 95, Write 90 card...4k video card.
The SanDisk ULTRA PLUS card is supposed to be 80/80 on bestbuy.com but on SanDisk website 80/40-50 (?) I forgot.
Either way, This testing get was done with the app suggested in the earlier posts in this thread and used the (full test) where you reboot the device. As mentioned.
I see a discrepancy in the test results differing from different WiFi. BestBuy's WiFi showed more Write in the public Store WiFi then my house.
I don't believe this app is fully correct, also, adds are running using the app, one can turn off the adds for "3 hrs". The fact the different Write speeds from location to location concerns me about this way of testing. No disrespect to the poster. I appreciate your input.
It is too bad I don't see a better app?
If anyone else would test, please use this app and the full test results. You have to change the settings of the app to show advanced test options or there is just one 'normal' test.
In my conclusion sofar, if you use the 'best', or 'most expensive ' card, your test scores ( Write speed ) will be more. A difference from SanDisk ULTRA PLUS Write 15, to Samsung PRO+ Write 30, is a difference for me to make a decision.
Currently prices (on sale at BestBuy )
SanDisk ULTRA PLUS 64GB= 24.99
Samsung PRO+ 64GB= 49.99
Double the price. FYI the SanDisk EXTREME PLUS 64GB is 49.99.
Why is it necessary to go through all that when all that is required is to right click, select format then choose exFAT?
Or let TWRP format it.
ashyx said:
Why is it necessary to go through all that when all that is required is to right click, select format then choose exFAT?
Or let TWRP format it.
Click to expand...
Click to collapse
Wondered the same after posting exactly that directly above... partitioning via command line introduces too much potential for error when simply reformatting an entire disk to a single partition IMO.