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Princess Nell
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Joined: 15 Apr 2005
Posts: 916

PostPosted: Sun Sep 30, 2012 8:46 pm    Post subject: Read Android SD card Reply with quote

My Android phone is dead, I took the SD card out and tried to read it under Gentoo through the MMC card reader in my laptop (SD card adapter), but no go.

Code:

Sep 25 19:45:27 beans kernel: mmc0: new SD card at address d555
Sep 25 19:45:27 beans kernel: mmcblk0: mmc0:d555 SD032 30.6 MiB
Sep 25 19:45:27 beans kernel: mmcblk0: unknown partition table


I find it strange that I cannot read a card from what is essentially another Linux system? At the very least, I'd expect VFAT or something like that, but not even the correct size of the card (4GB) is recognised. Any pointers?
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Jaglover
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Joined: 29 May 2005
Posts: 8291
Location: Saint Amant, Acadiana

PostPosted: Sun Sep 30, 2012 9:44 pm    Post subject: Reply with quote

It says unknown partition table, did you run some fdisk-like utility on it. Your kernel may have no support for partition table used.
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NeddySeagoon
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Joined: 05 Jul 2003
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Location: 56N 3W

PostPosted: Sun Sep 30, 2012 10:07 pm    Post subject: Reply with quote

Princess Nell,

It sounds like you phone killed the SD card as it died.

There should be a single VFAT partition with an MSDOS partition table.
Run testdisk on /dev/mmcblk0 to see it it can find any partitions but do not let it write a new partition table.

Use
Code:
mount -o ro,loop,offset=<bytes_to_partition> -t vfat /dev/mmcblk0 /mnt/someplace

to have a look round and hopefully recover the files.

You could try dd to make an image of the device too.
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Princess Nell
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Joined: 15 Apr 2005
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PostPosted: Mon Oct 01, 2012 8:02 am    Post subject: Reply with quote

The card reads and mounts correctly now. Not sure what went wrong the last time, maybe it didn't sit correctly in the adapter; or hibernation messed things up.

Thanks for the suggestions, testdisk is a great tool that I have used successfully before.
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mir3x
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Joined: 02 Jun 2012
Posts: 455

PostPosted: Wed Oct 03, 2012 1:39 pm    Post subject: Reply with quote

NeddySeagoon - just note - android uses ext3 and ext4 also ( or mostly maybe ) on sdcard.
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Johnriver743
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Joined: 09 Oct 2012
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PostPosted: Fri Oct 12, 2012 6:06 pm    Post subject: Reply with quote

Can any one tell me android ext2 also on sdcard or not?
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gentoo_ram
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Joined: 25 Oct 2007
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PostPosted: Sat Oct 13, 2012 5:39 pm    Post subject: Reply with quote

Standard Android behavior is to use the vfat filesystem on the SDcard. There will be an MBR partition table with one partition. Unless your Android phone OEM changed the behavior. Some data on the card may be encrypted (like applications moved to the SDcard), but the standard data (photos, music, etc.) will not be encrypted.
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