[Q] VFAT? - Android Q&A, Help & Troubleshooting

So I have a 32GB Samsung Evo in my phone, and I'm having terrible problems, andi don't k ow where to put this at.
At first, it kept switching to a read only state, and now its bringing up a EXOENT error.
It's formatted for VFAT, and want to switch to EXT4, maybe that'll stop the problems.
So, how do I format it for EXT4?

mke2fs -T ext4 /dev/block/yourblockdevice
do 'mount' and find which block device is the sdcard (normally mmcblk1)
you need to have root and execute those commands with adb shell or any shell emulator in android

nagalun said:
mke2fs -T ext4 /dev/block/yourblockdevice
do 'mount' and find which block device is the sdcard (normally mmcblk1)
you need to have root and execute those commands with adb shell or any shell emulator in android
Click to expand...
Click to collapse
It didn' worked for me, pls help

Related

[Q] Mount /system from adb recovery?

I've searched all over google and these forums and found lots instructions for different phones that don't seem to work for the vibrant.
I've been trying to modify some of the icons and such in the framework-res.apk. I'm trying to boot into recovery, mount the /system partition and push the modified file back.
Can anyone provide me with the adb command to mount the /system partition on the vibrant or a link to a thread that has the information.
Thanks...
you can't do it in stock recovery, you must be in clockworkmod recovery. IF you're in clockworkmod recovery, got the the mounts section and there you can mount /system, /data/, /sdcard and a few others with a graphical interface.
But incase you want it for some future reference:
Code:
su
mount -o rw,remount /dev/block/stl9 /system
and for this to work, su must be granted root permission (which it can't from stock recovery)
geoffcorey said:
you can't do it in stock recovery, you must be in clockworkmod recovery. IF you're in clockworkmod recovery, got the the mounts section and there you can mount /system, /data/, /sdcard and a few others with a graphical interface.
But incase you want it for some future reference:
Code:
su
mount -o rw,remount /dev/block/stl9 /system
and for this to work, su must be granted root permission (which it can't from stock recovery)
Click to expand...
Click to collapse
Thanks for the response. When I go into clockwork recovery I can't connect via adb? When I adb devices it doesn't list anything. When I'm in the stock recovery it lists my device.
Am I missing a step?
Thanks in advance for the help.

Boot Manager for the Optimus V

Anyone know if this will work on the Optimus V?
http://lifehacker.com/5826050/how-to-dual-boot-multiple-roms-on-your-android-phone
I don't know, but it looks like it does the same thing we do in recovery. Plus I think you would still have to restore all of your apps. Might as well just boot into recovery and do it the old fashioned way.
Sent from my LG-VM670 using XDA App
You only have to restore once. And as far as I know, it doesn't work for the v yet. (I tried). If someone gets it to work it would be awesome to get a tut.
"device name is found in your build.prop which is at /system/build.prop its at the line ro.product.build= and whatever that's equal to is your device name
the rest you need adb shell and need to reboot to recovery then type these mount your sdcard (to the phone not the computer) data system and cache then type the command "mount" without the quotes and look for the line in sdcard for /dev/block/something and that is what your sdcard block is
Next in adb shell still in recovery type the command "df -h" without the quotes and get the size of data system and cache and put them in and that's it you have unofficial support"
YThis is what one of the devs told me if anyone cares to try and post results.
Ya, I did all of that. My problem comes when trying to figure out which number is which.. Like is data your sd card and so on
Anyone willing to help me figure out which is which?
BigChillin said:
Anyone willing to help me figure out which is which?
Click to expand...
Click to collapse
here you go.
Filesystem Size Mounted on
/dev/block/mtdblock5 164.5M /system
/dev/block/mtdblock6 178.9M /data
/dev/block/mtdblock1 110.1M /cache
or, if you need more exact numbers:
Filesystem 1K-blocks Mounted on
/dev/block/mtdblock5 168448 /system
/dev/block/mtdblock6 183168 /data
/dev/block/mtdblock1 112768 /cache
I don't mind running the numbers for you but I don't want to help port that software.
I was considering making a multiboot recovery, but haven't decided it's worth my while for the time it'd take to refine enough to release.
edit: oh, yeah: android mounts the sdcard at /dev/block/vold/179:1
you can also access it from /dev/block/mmcblk0p1 (although the 0 increases by 1 every time you remove and replace the SD card until rebooting.)
will this work at optimus me?

how to mount internal storage through ADB?

Hi guys
my screen cracked today and I can't see anything, but I want to access the internal storage, can I do it through ADB command? how?
thanks
no one?
Sent from my Optimus 2X using Tapatalk
You need to be able to get the mobile into CWM recovery so adb will work. From the PC:
Code:
adb devices <- Your mobile should appear when this runs
adb shell
# mount /system
# mount /data
# mount /sdcard
Now you can copy the contents that you want with adb shell cp [source] [destination].
/sdcard is the internal memory of the phone
/sdcard/sd_external is the SD card attached to the phone (if any)
Hope this helps.
i have installed ABD and i have rebooted in recovery mode (CWM-based Recovery v5.0.2.3)
but when i type adb devices i got nothing
Any help ??
The phone has to be booted to use adb don't it with USB debugging ?
Sent from my GT-I9100 using xda premium
Hi,
I have a very similar problem, my screen is broken, though my phone still boots.
I have booted to the phone, ADB sees the device, and I can type ADB shell and get the # prompt.
I then type "mount /system" (without the quotation marks) but I get the following error message:
mount: can't read '/etc/fstab': No such file or directory
I am running Windows 7 64Bit. If anyone can advise me, that would be appreciated.
Thanks,
James
Hi, I have a smiliar need, my phone is stuck in some kind of bootmode where I cant access Android. I can however access it through adb, but when I run the mount /system command, i get:
Usage: mount -r -w -o options -t type device directory
same with /sdcard
there is no fstab file on the phone either.
How do I mount the internal storage? It's a OnePlus 3

Mounting the second partition of SDCARD as internal memory

Alright so here's the deal, my internal SDCARD is corrupted and the /data partition is unusable.
My device is i9003 and it's running on MIUI at the moment. By default MIUI didn't detect my external SD or my internal SD but after editing "vold.fstab" I was able to mount the first partition of my external SDCARD as external memory and everything was good, I could finally use the camera and pretty much do everything else.
But I was still unable to mount the second partition of my external SDCARD as my internal memory which meant none of my messages could be saved and the phone would pretty much go back to factory settings after a reboot, this apparently is because the /data partition (present on the internal memory) stores all the user data such as the time, the theme I'm using, etc and not having a /data partition meant none of these settings were really saved.
Having no internal memory also means I cannot install any apps such as Link2SD.
Moving on, after many hours of googling I found out that it might not be possible to mount the internal memory using "vold.fstab" and the only way to do it could be by mounting the memory manually during init.
So here's what I want again, I want to use the second partition of my external SDCARD as internal memory, this is likely to solve all my problems and make my phone usable again.
Thanks for all the help, appreciate it.
You need to edit /init.rc (or init.vendor.rc). To make the edits here stay, you'll need to create a new boot.img to flash your device with.
Have a look at an extract of mine init.<vendor>.rc:
Code:
on fs
# mount mtd partitions
# Mount /system rw first to give the filesystem a chance to save a checkpoint
#mount yaffs2 [email protected] /system
#mount yaffs2 [email protected] /system ro remount
# Use below two lines instead of above to run /system from SDcard instead of internal flash
mount ext3 /dev/block/mmcblk0p3 /system
mount ext3 /dev/block/mmcblk0p3 /system ro remount
#mount yaffs2 [email protected] /data nosuid nodev
mount ext3 /dev/block/mmcblk0p4 /data nosuid nodev
mount yaffs2 [email protected] /cache nosuid nodev
Compare the lines I've commented out with the others. Here both /data and /system resides on the SDcard, you only need to care about /data. Also remember your device nodes may not be named "mmcblk0p3" etc.
But you'll need to make those changes in the initramfs in your flashed boot.img to make them stay.
kuisma said:
You need to edit /init.rc (or init.vendor.rc). To make the edits here stay, you'll need to create a new boot.img to flash your device with.
Have a look at an extract of mine init.<vendor>.rc:
Code:
on fs
# mount mtd partitions
# Mount /system rw first to give the filesystem a chance to save a checkpoint
#mount yaffs2 [email protected] /system
#mount yaffs2 [email protected] /system ro remount
# Use below two lines instead of above to run /system from SDcard instead of internal flash
mount ext3 /dev/block/mmcblk0p3 /system
mount ext3 /dev/block/mmcblk0p3 /system ro remount
#mount yaffs2 [email protected] /data nosuid nodev
mount ext3 /dev/block/mmcblk0p4 /data nosuid nodev
mount yaffs2 [email protected] /cache nosuid nodev
Compare the lines I've commented out with the others. Here both /data and /system resides on the SDcard, you only need to care about /data. Also remember your device nodes may not be named "mmcblk0p3" etc.
But you'll need to make those changes in the initramfs in your flashed boot.img to make them stay.
Click to expand...
Click to collapse
Thanks for the reply man, mind telling me the how I can go about doing this?, I've got the ROM I flashed via CWM here with me, I could send it over to you if that would make things easier for you.
EDIT: would pulling init.rc via ADB, making the changes and pushing it back do the trick? or do I have to go for the boot.img? In case it's the latter, I'm going to need help doing it.
PhantomPhreek said:
Thanks for the reply man, mind telling me the how I can go about doing this?, I've got the ROM I flashed via CWM here with me, I could send it over to you if that would make things easier for you.
Click to expand...
Click to collapse
You'll find a good tutorial about how to work with boot images here: http://android-dls.com/wiki/index.php?title=HOWTO:_Unpack,_Edit,_and_Re-Pack_Boot_Images
If you already got the ROM in a file, this should be easy! Got ADB and FASTBOOT as well?
kuisma said:
You'll find a good tutorial about how to work with boot images here: http://android-dls.com/wiki/index.php?title=HOWTO:_Unpack,_Edit,_and_Re-Pack_Boot_Images
If you already got the ROM in a file, this should be easy! Got ADB and FASTBOOT as well?
Click to expand...
Click to collapse
I'm not sure I've got FASTBOOT but I've definitely got ADB and I've also got the ROM. Would pulling init.rc via ADB, making the changes and pushing it back do the trick? or do I have to go for the boot.img?.
PhantomPhreek said:
I'm not sure I've got FASTBOOT but I've definitely got ADB and I've also got the ROM. Would pulling init.rc via ADB, making the changes and pushing it back do the trick? or do I have to go for the boot.img?.
Click to expand...
Click to collapse
No. You need to reboot the phone for the init.rc script to execute, and once you reboot the phone, the root file system is overwritten by the flashed image ... Catch 22.
You'll NEED to create a new boot.img with a new initramfs containing your changes.
kuisma said:
No. You need to reboot the phone for the init.rc script to execute, and once you reboot the phone, the root file system is overwritten by the flashed image ... Catch 22.
You'll NEED to create a new boot.img with a new initramfs containing your changes.
Click to expand...
Click to collapse
Shucks, this explains why it didn't work. Alright, so I extract boot.img from the rom, follow the tutorial.What is it that I have to edit again? "/init.rc" or "init.<vendor>.rc"?.
Thanks for the help man, appreciate it.
EDIT: Looks like the tutorial is meant for Linux, I'm currently on Windows. I might be asking for a lot here but is there any chance I could get you to do it for me?
PhantomPhreek said:
Shucks, this explains why it didn't work. Alright, so I extract boot.img from the rom, follow the tutorial.What is it that I have to edit again? "/init.rc" or "init.<vendor>.rc"?.
Thanks for the help man, appreciate it.
Click to expand...
Click to collapse
Of course, MIUI may have some boot hooks you could use to re-mount /data after boot. I know nothing about that ROM. Also keep in mind that each time you update the ROM, you have to remake this edit.
Also, no idea what MIUI calls its init.rc, you'll just have to see for yourself. If you've got the mount commands in init.rc, fine. Else look elsewhere.
A good first step would to make sure you really are able to flash a new boot.img. Download fastboot and verify your device understands it. Else you have to use some proprietary flash program, and I'm not familiar with Samsungs bootloaders at all. Ask in the Samsung forum if so.
kuisma said:
Of course, MIUI may have some boot hooks you could use to re-mount /data after boot. I know nothing about that ROM. Also keep in mind that each time you update the ROM, you have to remake this edit.
Also, no idea what MIUI calls its init.rc, you'll just have to see for yourself. If you've got the mount commands in init.rc, fine. Else look elsewhere.
A good first step would to make sure you really are able to flash a new boot.img. Download fastboot and verify your device understands it. Else you have to use some proprietary flash program, and I'm not familiar with Samsungs bootloaders at all. Ask in the Samsung forum if so.
Click to expand...
Click to collapse
Looks like the tutorial is meant for Linux, I'm currently on Windows. I might be asking for a lot here but is there any chance I could get you to do it for me?. ADB and I do see the file init.rc and I also see the mount commands as well. I used adb shell to run the command you sent over with a few edits for second partition and it does mount but as you said, it all goes away after reboot.
PhantomPhreek said:
Looks like the tutorial is meant for Linux, I'm currently on Windows. I might be asking for a lot here but is there any chance I could get you to do it for me?. ADB and I do see the file init.rc and I also see the mount commands as well. I used adb shell to run the command you sent over with a few edits for second partition and it does mount but as you said, it all goes away after reboot.
Click to expand...
Click to collapse
Hmm... are you even able to create a second ext3 partition on the SDcard using Windos..?
kuisma said:
Hmm... are you even able to create a second ext3 partition on the SDcard using Windos..?
Click to expand...
Click to collapse
haha, I used CWM to create the partitions initially, but then I used a software called MiniTool, works well. Can I get you to to do it?
PhantomPhreek said:
Alright so here's the deal, my internal SDCARD is corrupted and the /data partition is unusable.
Click to expand...
Click to collapse
The ROM you are using requires an ext4 partition as partition #3 of the SDcard. This is mounted as /data. Repartition your SDcard #1 as FAT, #2 whatever, and #3 as ext4, and everything will work as intended. :victory:
I guess you've missed this in the ROM documentation ...
kuisma said:
The ROM you are using requires an ext4 partition as partition #3 of the SDcard. This is mounted as /data. Repartition your SDcard #1 as FAT, #2 whatever, and #3 as ext4, and everything will work as intended. :victory:
I guess you've missed this in the ROM documentation ...
Click to expand...
Click to collapse
Wah~ really?, I'll try that and get back here with the results. Thanks a lot!.
EDIT: Is it FAT or FAT32?
PhantomPhreek said:
Wah~ really?, I'll try that and get back here with the results. Thanks a lot!.
EDIT: Is it FAT or FAT32?
Click to expand...
Click to collapse
FAT32.
kuisma said:
FAT32.
Click to expand...
Click to collapse
Tried but didn't work out. I made three partitions, all primary - #1 FAT32, #2 FAT32, #3 EXT4. Plugged the SDCARD in and the external memory was detected as usual, but not the internal memory.
I tried changing the time, it was reset back after reboot.
After that I left the SDCARD as is and flashed the ROM again and now, neither the internal nor the external memory are detected. This is probably because the "vold.fstab" which was edited by me, was overwritten on re flashing.
I'm at a dead end, any ideas?
PhantomPhreek said:
Tried but didn't work out. I made three partitions, all primary - #1 FAT32, #2 FAT32, #3 EXT4. Plugged the SDCARD in and the external memory was detected as usual, but not the internal memory.
I tried changing the time, it was reset back after reboot.
After that I left the SDCARD as is and flashed the ROM again and now, neither the internal nor the external memory are detected. This is probably because the "vold.fstab" which was edited by me, was overwritten on re flashing.
I'm at a dead end, any ideas?
Click to expand...
Click to collapse
Attach an output of "df", "mount", the file "/init.latona.rc" and "/etc/vold.fstab" here, and I'll have a look at it. Hmm... include the output of "dmesg" as well, to be on the safe side.
kuisma said:
Attach an output of "df", "mount", the file "/init.latona.rc" and "/etc/vold.fstab" here, and I'll have a look at it. Hmm... include the output of "dmesg" as well, to be on the safe side.
Click to expand...
Click to collapse
What bugs me is the fact that the external SD is not detected, from what little knowledge I have, external SD is unrelated to the internal SD which I currently have problems with, meaning it should be detected without a problem.
Also I have to add, CWM doesn't detect my external SD right away, when I go to recovery and go over to "Choose zip from sdcard" it says "E:Can't mount /sdcard/". The solution I've found coincidentally is to go to "mounts & storage", mount "/emmc", pull the SDCARD out plug it in again and then "mount /sdcard" this works perfectly and I'm able to flash roms from the sdcard.
One problem at a time, please. Attach the files I requsted, so we can determine why /data failes to mount. Looking at your ROM:
Code:
$ grep " /data$" init.latona.rc
mount ext4 /dev/block/mmcblk0p3 /data
I want to know why this fails, and I guess the answer is in the dmesg output. And please before I'll get another whiskey.
kuisma said:
One problem at a time, please. Attach the files I requsted, so we can determine why /data failes to mount. Looking at your ROM:
Code:
$ grep " /data$" init.latona.rc
mount ext4 /dev/block/mmcblk0p3 /data
I want to know why this fails, and I guess the answer is in the dmesg output. And please before I'll get another whiskey.
Click to expand...
Click to collapse
I can't seem to find "/init.latona.rc" everything else you requested I've mailed them over already
EDIT: the dmesg output is AFTER I mounted "/sdcard" manually as explained in my previous post.
PhantomPhreek said:
I can't seem to find "/init.latona.rc" everything else you requested I've mailed them over already
EDIT: the dmesg output is AFTER I mounted "/sdcard" manually as explained in my previous post.
Click to expand...
Click to collapse
The files you mailed me does not correspond to the ROM you refereed.
The /etc/fstab show that /data is mounted as an rfs file system, not ext4. So either format partition #3 on the sdcard as rfs (Samsung proprietary), or edit /etc/fstab and change "rfs" to "ext4". I'd prefer the later, assuming your kernel supports ext4. Else use ext3.
Code:
/dev/block/mmcblk0p3 /data rfs rw
But you can't have flashed the ROM you told me you did. It excepted an ext4 file system ...

CM10 - external_sd mount location

I jumped from stock to CM10 and have found an issue I need resolved, but am not sure how to go about it.
On stock, I didn't have
/sdcard/ is the path for the internal memory
/sdcard/external_sd/ is the path for the actual add-in slot you buy yourself.
This is great because the file explorer apps don't need special access to get to, and things are at least somewhat logical on how they're laid out.
On CM10:
/storage/sdcard0/ is internal memory
/storage/sdcard1/ is external memory
There are symbolic links of /sdcard and /external_sd but to access the latter, I need to tell apps like ES file explorer to change their base path rather than just having a nested mount structure.
I've tried using terminal emulator to go in and create a symbolic link, but I get 'operation not permitted' messages. I've also tried editing /etc/vold.fstab to have it change the mount from /storage/sdcard1 to /storage/sdcard0/external_sd, but the filesystem is read-only and 'mount -o remount,rw /' doesn't have an effect even though it doesn't complain.
How can I change the mount structure back to how I want it and how it's easier to access/navigate it in my apps?
Run into some situation, hopefully someone can shed some light
Did you mount this files as r/w?
Sent from my SAMSUNG-SGH-I717 using xda premium
johnrippa said:
Did you mount this files as r/w?
Sent from my SAMSUNG-SGH-I717 using xda premium
Click to expand...
Click to collapse
In my original post I mention trying to get it remounted as r/w, the command doesn't complain but the filesystem stays read-only.
Try busybox mount -o remount,rw /system
If that fails, use an app to do it.
ChronoReverse said:
Try busybox mount -o remount,rw /system
If that fails, use an app to do it.
Click to expand...
Click to collapse
Any particular apps to recommend? I had tried issuing the remount command on / and not /system. I will give that another try.
ChronoReverse said:
Try busybox mount -o remount,rw /system
If that fails, use an app to do it.
Click to expand...
Click to collapse
I was able to modify the mount point to be /storage/sdcard0/external_sd/ for the external SD slot, but when I rebooted CM it got stuck and would buzz every 10 seconds or so and stayed that way indefinitely. Not sure why this breaks CM so bad but there you have it. Oh well.
Might be a better idea to just add links so you get your old /sdcard/external_sd
I'm not currently on a CM10 ROM or else I'd test.
ChronoReverse said:
Might be a better idea to just add links so you get your old /sdcard/external_sd
I'm not currently on a CM10 ROM or else I'd test.
Click to expand...
Click to collapse
Symbolic links don't work on a FAT based filesystem (which the SD card mounts are), unfortunately.

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