Specifically, what do I need to install on my gtab so that it can read an sdcard formatted to ext2?
I've already installed Clockworkmod and Vegan-Tab Ginger. Maybe I need a different kernel too? I know very little about kernels - Are they device specific? Are they interchangeable? Can I change the kernel without wiping my files?
Has anyone ever had success with ext2 on the gtab?
deadfraggle said:
Specifically, what do I need to install on my gtab so that it can read an sdcard formatted to ext2?
Click to expand...
Click to collapse
Nothing.
I know very little about kernels - Are they device specific?
Click to expand...
Click to collapse
They have to be--that's their function after all.
Are they interchangeable?
Click to expand...
Click to collapse
They should be. For the gTablet, you can use either the Clemsyn or Pershoot kernels. Both have native extn support.
Can I change the kernel without wiping my files?
Click to expand...
Click to collapse
Yes.
Has anyone ever had success with ext2 on the gtab?
Click to expand...
Click to collapse
ext2/3/4 are all natively supported by the linux kernel, and issuing a mount command will work if you do it on the command line. However, the automounter program, called vold, likes to have ext4 or VFAT (aka FAT32) filesystems on the SD card. If your ext2 formatted SD card is not automatically mounted, format it again as ext4.
Formatted the sdcard to ext4, but still cannot read anything off it.
As for mounting through the terminal, if I use
fdisk -l
it shows nothing, not even an error. Is there another way to list disks so I know what to mount?
What I'm trying to do is use the Debian installer for Android, but the only version I could find is 2 years old. It's probably based on Lenny or earlier which does not have native ext4 support.
deadfraggle said:
Formatted the sdcard to ext4, but still cannot read anything off it.
Click to expand...
Click to collapse
What ROM are you on? Are you running Android or something else?
As for mounting through the terminal, if I use
fdisk -l
it shows nothing, not even an error. Is there another way to list disks so I know what to mount?
Click to expand...
Click to collapse
Code:
$ su
# /system/xbin/fdisk -l /dev/block/mmcblk3
Disk /dev/block/mmcblk3: 16.0 GB, 16097738752 bytes
255 heads, 63 sectors/track, 1957 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/block/mmcblk3p1 1 1709 13720703 c Win95 FAT32 (LBA)
/dev/block/mmcblk3p2 1709 1958 1999744+ 83 Linux
Use /dev/block/mmcblk2 for the external SD card. Mount it as:
Code:
$ su
# mount /dev/block/mmcblk2p1 /some/path
or
Code:
$ su
# mount -t ext4 /dev/block/mmcblk2p2 /some/path
rajeevvp said:
What ROM are you on? Are you running Android or something else?
Click to expand...
Click to collapse
Vegan-Tab Ginger edition
rajeevvp said:
Code:
$ su
# /system/xbin/fdisk -l /dev/block/mmcblk3
Click to expand...
Click to collapse
This gives me similar results to yours.
rajeevvp said:
Use /dev/block/mmcblk2 for the external SD card. Mount it as:
Code:
$ su
# mount /dev/block/mmcblk2p1 /some/path
Click to expand...
Click to collapse
My result:
Code:
$ su
# mount /dev/block/mmcblk2p1 /micro
mount: mounting /dev/block/mmcblk2p1 on /micro failed: No Such file or directory
Also tried
mount /dev/block/mmcblk2p2 /micro
with the same result.
rajeevvp said:
or
Code:
$ su
# mount -t ext4 /dev/block/mmcblk2p2 /some/path
Click to expand...
Click to collapse
My result:
Code:
$ su
# mount -t ext4 /dev/block/mmcblk2p2 /micro
mount: mounting /dev/block/mmcblk2p2 on /micro failed: No Such file or directory
Edit:
If I insert a ext2 formatted sdcard, I get a notice that it is being scanned for errors. It goes away after a minute or so.
If I go to /sdcard2 in Root Explorer, the folder is empty but the stats show a correct 2 gb of used space and the correct amount of free space.
(Also in Root Explorer, if I try to create a test file, it says 'successful' but no file is created.)
If someone here owns a gtab and can access a ext2/4 sdcard, please let me know what setup/Rom you are using. Or if you own an extra sdcard you can format to ext2, and use some other aftermarket ROM/different kernel on your gtab, please test and post your results.
The commands I gave were just examples, you'll have to adjust them to suit your system.
deadfraggle said:
If I insert a ext2 formatted sdcard, I get a notice that it is being scanned for errors. It goes away after a minute or so.
Click to expand...
Click to collapse
That looks like the correct behaviour. The external SD card is being fsck'd and then automounted.
If I go to /sdcard2 in Root Explorer, the folder is empty but the stats show a correct 2 gb of used space and the correct amount of free space.
Click to expand...
Click to collapse
This, again, is correct, except that on a newly created filesystem, Root Explorer should've shown a lost+found directory.
(Also in Root Explorer, if I try to create a test file, it says 'successful' but no file is created.)
Click to expand...
Click to collapse
Reformat the filesystem again and try creating a file using the command line:
Code:
$ su
# echo test > /mnt/sdcard2/test.txt
# cat /mnt/sdcard2/test.txt
test
#
My external SD card is formatted as ext3 and I have no problem using Root Explorer. With other file managers, you'll have to be careful because of the standard Unix permissions that come into effect on all extn filesystems. If you want to use file managers other than Root Explorer, just create a new directory on your ext2 filesystem and give that directory a user of "system" and a group of "sdcard_rw", and give (at least) the group "rwx" permissions. Use the user, group and permissions of the /mnt/sdcard directory as a guide:
Code:
$ ls -ld /mnt/sdcard
d---rwxr-x 22 system sdcard_rw 8192 Jan 1 1970 /mnt/sdcard
$ su
# mkdir /mnt/sdcard2/user-dir
# chmod 0775 /mnt/sdcard2/user-dir [I]#or 0075 to exactly match /mnt/sdcard[/I]
# chown system.sdcard_rw /mnt/sdcard2/user-dir
If you don't want to bother with all this, just format the SD card as VFAT, and Android will automatically mount the VFAT filesystem with an owner of "system" and a group of "sdcard_rw". And since (all?) file managers belong to the "sdcard_rw" group, they get automatic read-write permissions to that filesystem. BTW, the Terminal Emulator app also belongs to the "sdcard_rw" group, so you can freely write onto VFAT formatted SD cards on the command line without resorting to the 'su' command (the example above).
Granted, it's been a while since I researched this - but I learned many months ago that the version of VOLD in Froyo does not support anything else but vFAT - so it just won't mount EXT2, or NTFS for that matter.
the mount command would bypass VOLD and we know that NTFS should work, if it's a custom kernel. Conceivably EXT2 should also work, but since it was all manual scripting I just stopped researching it - mainly because I'd still have issues using the card with other devices so it wouldn't really be a portable solution anymore.
As much as I detest FAT32 for its file size limitations, it's still the "standard" between portable devices. The various vendors have yet to figure out a replacement, since they can't seem to agree on anything.
rajeevvp said:
My external SD card is formatted as ext3 and I have no problem using Root Explorer.
Click to expand...
Click to collapse
Figures. Never tried ext3, mainly because it's not a readily available option in Ubuntu. Tried to format to ext3 via the terminal but got a weird error, even after unmounting the drive:
"/dev/sdb is apparently in use by the system; will not make a filesystem here!"
So I booted in to Parted Magic with my netbook, wiped the sdcard, and created a new ext3 partition.
Success!!
The sdcard auto-mounts, and is accessible by Root Explorer, ES File Explorer and File Manager.
Ext3 will suit my purposes just fine. Sorry to make you write all the rest of your post, but it will be a handy reference.
Thank you a million times over!
@ roebeet
I'm humbled this post got your attention. Thanks for the great work!
deadfraggle said:
Figures. Never tried ext3, mainly because it's not a readily available option in Ubuntu.
Click to expand...
Click to collapse
The ext3 format was the default filesystem of Ubuntu, until just recently. It is generally considered better to use ext2 on a SD card. Since a SD card has a limited number of read/writes, a journaling filesystem like ext3/ext4 would use up the limited number of read/writes faster than using ext2. Also, never create a swap partition on a flash drive or SD card.
To format a SD card in Ubuntu, first determine the device name:
Code:
[email protected]:~$ sudo fdisk -l
[sudo] password for paul:
Disk /dev/sda: 64.6 GB, 64609058816 bytes
255 heads, 63 sectors/track, 7854 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0000d996
Device Boot Start End Blocks Id System
/dev/sda1 * 1 3890 31246393+ 83 Linux
/dev/sda2 3891 7854 31840830 83 Linux
Disk /dev/sdb: 16.4 GB, 16437477376 bytes
255 heads, 63 sectors/track, 1998 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000b3366
Device Boot Start End Blocks Id System
/dev/sdb1 1 1998 16048903+ 83 Linux
My EEEPC has a 64 GB hard drive, and a 16 GB SDHC card. So the card I want to format is /dev/sdb1. Use fdisk again for the formatting, here are the steps copied directly from my terminal:
Run commands with root privileges (sudo).
Find the disk:
# sudo fdisk -l
Format the disk (sdb1):
# sudo fdisk /dev/sdb1
Command (m for help):d (delete any existing partitions)
Command (m for help):n (create a new partition)
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4):1
Command (m for help):w (to write the changes to the disk)
Format the card. You may need to unmount it first:
# sudo umount /dev/sdb1
# sudo mkfs -t ext3 /dev/sdb1
I bought this 64GB SanDisk sd card (http://www.amazon.com/SanDisk-microSDXC-Memory-Adapter-SDSDQUA-064G-U46A/dp/B007WTAJTO) which was working fine in my stock ROM for a few weeks. I then flashed a custom ROM (latest stable Resurrection Remix) that didn't recognize it. When I immediately flashed back to the stock ROM it also didn't recognize the card anymore. Surely that's not an issue of physical damage, as the timing would be quite coincidental! Something happened while installing that custom ROM to change maybe partition tables or whatever on that sd card.
What tells me for sure that the card is NOT physically damaged is that I can successfully store nandroid backups to it and restore from nandroid backups on it, but only from ClockworkMod Recovery 5.5.*. I've tried many other recoveries (even the newer, touch-based ClockwordMod Recoveries), as well as a couple more ROMs and nothing else recognizes the drive at all. But clearly the drive itself isn't damaged. Unfortunately ClockworkMod Recovery 5.5.* doesn't have any sort of ability to let me connect to my computer in USB mass storage mode or otherwise get the data off of the card
I was able to restore data from the a disk dump of the card using 'photorec' recovery but it restored every one of the 90,000 files on that card (even though only about 1,000 are the ones I actually need and not 'system' or 'backup' files) into a restore directory where every file name is named like f3728467371291.gz and with all the same timestamps, so it would take me forever to figure out which files are mine, so mounting the drive would really help.
I also realize using this card with my Android may have been risky in the first place, see http://www.transformerforums.com/forum/general-discussion/28678-sandisk-64gb-microsd-woes.html, but it was working successfully and the card itself isn't damaged so there must be a way to get the data off in a sane way. (I won't use this card in future with my Android.)
I put the sd card into my Ubuntu 12.04 laptop and it didn't get recognized automatically like what happens with other sd cards. So I dig some digging and it says that the card (at /dev/mmcblk0, with partition /dev/mmcblk0p1) is 'HPFS/NTFS/exFAT' in the output below (but first I took a 'dd' disk images of both the whole card, mmcblk0, and the partition, mmcblk0p1).
Any help you could provide would be greatly appreciated. Thanks!
Code:
$ sudo dd if=/dev/mmcblk0 of=~/mmcblk0
$ sudo dd if=/dev/mmcblk0p1 of=~/mmcblk0p1
$ sudo fdisk -l ~/mmcblk0
Disk mmcblk0: 63.9 GB, 63864569856 bytes
255 heads, 63 sectors/track, 7764 cylinders, total 124735488 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
mmcblk0p1 32768 124735487 62351360 7 HPFS/NTFS/exFAT
Trying to mount as NTFS but get error:
Code:
$ sudo mount -t ntfs ~/mmcblk0p1 /mnt/sdcard
NTFS signature is missing.
Failed to mount '/dev/mmcblk0p1': Invalid argument
The device '/dev/mmcblk0p1' doesn't seem to have a valid NTFS.
Maybe the wrong device is used? Or the whole disk instead of a
partition (e.g. /dev/sda, not /dev/sda1)? Or the other way around?
Trying to mount as exFAT but get error:
Code:
$ sudo apt-add-repository ppa:relan/exfat
$ sudo apt-get update
$ sudo apt-get install fuse-exfat
$ sudo mount -t exfat ~/mmcblk0p1 /mnt/sdcard
FUSE exfat 0.9.8
ERROR: exFAT file system is not found.
Getting some info about the whole card:
Code:
$ sudo file -s ~/mmcblk0
/dev/mmcblk0: x86 boot sector; partition 1: ID=0x7, starthead 10, startsector 32768, 124702720 sectors, extended partition table (last)\011, code offset 0x0
Getting some info about the partition:
Code:
$ sudo file -s ~/mmcblk0p1
/dev/mmcblk0p1: x86 boot sector, code offset 0x52
Do you have any idea how I could mount this card successfully?
Hi,
could you find a solution for your problem? It seems I have a similar one. My 32GB SD is perfectly working when I use ext3/4 but not using exfat.
I have no idea how to fix it. Using ext3/4 is not the best solution due to different ownerships, permissions ecc.
Regards,
Enkidu
There is an issue with my SDcard, I don't know how it happened, I did nothing special on it.
It appears as unformatted BUT, I know that the data is still there because the CWM manages to browse files if I get into the menu "install zip from /sdcard1", but it can't see anything if I try a "restore from sdcard1"...
Weird huh ?
So I have an ubuntu build and I'd like to try to repair the "masterboot" with your help
I never did this before so I don't really know what I need, SDCard is 32 GB class 10.
When I plug my phone from CWM and enable the mount the SDcard on usb I got this error message :
Error mounting: mount: /dev/sdb1: can't read superblock
Here is the result of the "fdisk -l" command :
Code:
Disk /dev/sdb: 32.0 GB, 32018268160 bytes
32 heads, 63 sectors/track, 31019 cylinders, total 62535680 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x4d544f4f
Device Boot Start End Blocks Id System
/dev/sdb1 2048 62535679 31266816 b W95 FAT32
Which actually looks weird, I thought that my sdcard were ext4 formated, well but I am not 100% sure about that...
Here the result of the command "fsck -y /dev/sdb1"
Code:
fsck from util-linux 2.20.1
dosfsck 3.0.12, 29 Oct 2011, FAT32, LFN
/
Contains a free cluster (2). Assuming EOF.
FAT32 root dir starts with a bad cluster!
What else can I do ?
Ok great...
Thanks anyway...
For information, I managed to backup data from the SDcard using testdisk, then using again testdisk I tried a repair, and it actually rewrote the superblock and the card is alive again without wiping
I have encountered a problem with partitioning my J320FN.. I mounted mmcblk0 which is the root directory of the device and contains partitions 1-27. I wish to make the system partition smaller (since my system folder is 1.2gb smaller than the official) and give that space to userdata which will then be available and usuable even in Smart Manager.
The problem begins with the SYSTEM and userdata partitions not being consecutive... I have a HIDDEN partition between them
[email protected]:/ $ su
[email protected]:/ # parted /dev/block/mmcblk0
GNU Parted 1.8.8.1.179-aef3
Using /dev/block/mmcblk0
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) p
p
Error: The backup GPT table is not at the end of the disk, as it should be.
This might mean that another operating system believes the disk is smaller.
Fix, by moving the backup to the end (and removing the old backup)?
Fix/Ignore/Cancel? i
i
Warning: Not all of the space available to /dev/block/mmcblk0 appears to be
used, you can fix the GPT to use all of the space (an extra 16384 blocks) or
continue with the current setting?
Fix/Ignore? i
i
Model: MMC QN16BB (sd/mmc)
Disk /dev/block/mmcblk0: 7818MB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
25 344MB 2491MB 2147MB ext4 SYSTEM
26 2491MB 2701MB 210MB ext4 HIDDEN
27 2701MB 7806MB 5104MB ext4 userdata
Click to expand...
Click to collapse
Now, the thing this hidden partition is the same size as the CACHE partition which is located at partition 24 mmcblk0p24 /CACHE and is 210mb(exact same size in bytes)
24 134217728B 343932927B 209715200B ext4 CACHE
25 343932928B 2491416575B 2147483648B ext4 SYSTEM
26 2491416576B 2701131775B 209715200B ext4 HIDDEN
27 2701131776B 7805599743B 5104467968B ext4 userdata
Click to expand...
Click to collapse
Im kinda worried about what is in the hidden partition as i will need to dd it out and back in after creating the partition anew.. Anyone know what is stored in hidden partition or how to pull it? dd doesn't give an output file with .img or .zip, they're just broken files...
TIA
Peace [emoji1]
Bump..
Howdy. Just a question: if I select "use as internal memory" for my 128 GB SD card I inserted in my Nokia 1, does that mean I won't be able to access the said SD card if I try to plug the Nokia 1 to a PC?
Jem2291 said:
Howdy. Just a question: if I select "use as internal memory" for my 128 GB SD card I inserted in my Nokia 1, does that mean I won't be able to access the said SD card if I try to plug the Nokia 1 to a PC?
Click to expand...
Click to collapse
Hi,
I've used an 8 Gig SanDisk MicroSD card as internal memory on my Nokia 1.
The short answer to your question is no, probably not. at least not without a bit of effort.
I just plugged the SD card into a Linux box, which give me the below data
Code:
[[email protected] ~]$ sudo fdisk -l /dev/sdc
Disk /dev/sdc: 7.4 GiB, 7948206080 bytes, 15523840 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 98FA1F61-0482-4F31-A074-73550CC9B369
Device Start End Sectors Size Type
/dev/sdc1 2048 34815 32768 16M unknown
/dev/sdc2 34816 15523806 15488991 7.4G unknown
[[email protected] ~]$
[[email protected] ~]$
[[email protected] ~]$
[[email protected] ~]$ sudo gdisk -l /dev/sdc
GPT fdisk (gdisk) version 1.0.3
Partition table scan:
MBR: protective
BSD: not present
APM: not present
GPT: present
Found valid GPT with protective MBR; using GPT.
Disk /dev/sdc: 15523840 sectors, 7.4 GiB
Model: USB3.0 CRW -SD
Sector size (logical/physical): 512/512 bytes
Disk identifier (GUID): 98FA1F61-0482-4F31-A074-73550CC9B369
Partition table holds up to 128 entries
Main partition table begins at sector 2 and ends at sector 33
First usable sector is 34, last usable sector is 15523806
Partitions will be aligned on 2048-sector boundaries
Total free space is 2014 sectors (1007.0 KiB)
Number Start (sector) End (sector) Size Code Name
1 2048 34815 16.0 MiB FFFF android_meta
2 34816 15523806 7.4 GiB FFFF android_expand
When I plugged it into one of my Win10 boxes and it just offered to format it for me.
I'm not sure what file system is in use as it was reported as unknown. You'll need to figure out what file system is in use and install whatever tools your PC OS needs to work with that file system.