Arch Linux

toogy

Member

Registered: 2013-10-25

Posts: 46

/dev/mmcblk0 SD card not mountable, wrong fs, bad option

Hi,

I am not able to mount my SD card anymore. It's a SD card I use in my camera to take pics and there are some pics I don't want to lose on it.

» sudo mount /dev/mmcblk0p1 /mnt/leatmp                                                                                                                               8 ↵
mount: wrong fs type, bad option, bad superblock on /dev/mmcblk0p1,
       missing codepage or helper program, or other error

       In some cases useful info is found in syslog - try
       dmesg | tail or so.

\» sudo fsck /dev/mmcblk0                                                                                                                                              8 ↵
fsck from util-linux 2.24.2
e2fsck 1.42.10 (18-May-2014)
ext2fs_open2: Bad magic number in super-block
fsck.ext2: Superblock invalid, trying backup blocks...
fsck.ext2: Bad magic number in super-block while trying to open /dev/mmcblk0

The superblock could not be read or does not describe a valid ext2/ext3/ext4
filesystem.  If the device is valid and it really contains an ext2/ext3/ext4
filesystem (and not swap or ufs or something else), then the superblock
is corrupt, and you might try running e2fsck with an alternate superblock:
    e2fsck -b 8193 <device>
 or
    e2fsck -b 32768 <device>

What can I do?

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berbae

Member

From: France

Registered: 2007-02-12

Posts: 1,304

Re: /dev/mmcblk0 SD card not mountable, wrong fs, bad option

Bonjour,
Look at the messages in 'dmesg' concerning the SD card after you plugged it in.
fsck takes a file system argument like mount; surely 'dev/mmcblk0' is not one.
What is the file system type on the SD card?
Do you have an entry for it in '/etc/fstab'?

toogy

Member

Registered: 2013-10-25

Posts: 46

Re: /dev/mmcblk0 SD card not mountable, wrong fs, bad option

Bonjour berbae

(I put the fsck result without knowing what the program was really doing, thought it could help. apparently it doesn't ^^)

here is the result of dmesg when I plug it in:

[24874.131902] mmc0: new high speed SDHC card at address b368
[24874.132125] mmcblk0: mmc0:b368 NCard 7.46 GiB
[24874.133074]  mmcblk0: p1

fdisk -l:

» sudo fdisk /dev/mmcblk0 -l                                                                                                                                          1 ↵

Disk /dev/mmcblk0: 7.5 GiB, 8018460672 bytes, 15661056 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: dos
Disk identifier: 0x00000000

Device         Boot Start       End  Blocks  Id System
/dev/mmcblk0p1       8192  15661055 7826432   b W95 FAT32

lsblk:

» lsblk
NAME        MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda           8:0    0 465.8G  0 disk 
├─sda1        8:1    0  1007K  0 part 
├─sda2        8:2    0    20G  0 part /
├─sda3        8:3    0   300M  0 part /boot
├─sda4        8:4    0    12G  0 part /var
├─sda5        8:5    0   300G  0 part /home
├─sda6        8:6    0    16G  0 part [SWAP]
└─sda7        8:7    0 117.5G  0 part 
sdb           8:16   0 111.8G  0 disk 
├─sdb1        8:17   0   100M  0 part 
└─sdb2        8:18   0 111.7G  0 part 
mmcblk0     179:0    0   7.5G  0 disk 
└─mmcblk0p1 179:1    0   7.5G  0 part 

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ewaller

Administrator

From: Pasadena, CA

Registered: 2009-07-13

Posts: 20,715

Re: /dev/mmcblk0 SD card not mountable, wrong fs, bad option

The superblock could not be read or does not describe a valid ext2/ext3/ext4
filesystem.  If the device is valid and it really contains an ext2/ext3/ext4
filesystem (and not swap or ufs or something else), then the superblock
is corrupt, and you might try running e2fsck with an alternate superblock:

I believe this.  Most cameras don't use ext file systems.  Mayhaps if you mounted it as fat32?

Edit: Actually, the -t switch for mount is vfat

Last edited by ewaller (2014-07-28 17:33:49)

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alphaniner

Member

From: Ancapistan

Registered: 2010-07-12

Posts: 2,810

Re: /dev/mmcblk0 SD card not mountable, wrong fs, bad option

Run lsblk --fs to display filesystem info.

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firecat53

Member

From: Lake Stevens, WA, USA

Registered: 2007-05-14

Posts: 1,542

Website

Re: /dev/mmcblk0 SD card not mountable, wrong fs, bad option

Silly question, but have you rebooted yet after a recent kernel upgrade? This has bitten me multiple times with removable devices.

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toogy

Member

Registered: 2013-10-25

Posts: 46

Re: /dev/mmcblk0 SD card not mountable, wrong fs, bad option

@alphaniner: lsblk --fs doesn't give me any information about my /dev/mmcblk0p1:

» lsblk --fs
NAME        FSTYPE LABEL           UUID                                 MOUNTPOINT
sda                                                                     
├─sda1                                                                  
├─sda2      ext4                   0fdbf91c-fda9-4cf6-8ca0-212a41e2b5cf /
├─sda3      ext2                   3777d412-3607-4309-8de6-ffd8fbf5ab05 /boot
├─sda4      ext4                   47130517-c2d6-479c-ba4c-dbbf931a579f /var
├─sda5      ext4                   82fdf3db-5045-44e5-82fa-67bbb1a26d74 /home
├─sda6      swap                   6d91e1c4-0d3e-48b0-8d53-88f96d575cbb [SWAP]
└─sda7                                                                  
sdb                                                                     
├─sdb1      ntfs   System Reserved B6208E21208DE927                     
└─sdb2      ntfs                   6210917410915041                     
mmcblk0                                                                 
└─mmcblk0p1

mount -t vfat:

» sudo mount -t vfat /dev/mmcblk0p1 /mnt/leatmp 
mount: wrong fs type, bad option, bad superblock on /dev/mmcblk0p1,
       missing codepage or helper program, or other error

       In some cases useful info is found in syslog - try
       dmesg | tail or so.

@firecat53: yup I rebooted after recent kernel upgrade. Actually my sister tried to mount it on her macbook and it didn't work, that's why I'm trying manually on arch.

thank you all for your replies. If anyone has any idea about how I could retrieve these pics... (pics of my sister's trip to Lahos and Birmania, beautiful ones, would be sad to lose them)

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Awebb

Member

Registered: 2010-05-06

Posts: 6,688

Re: /dev/mmcblk0 SD card not mountable, wrong fs, bad option

Before you do anything, copy the entire sdcard, not just the partition to a file with dd.

Slithery

Administrator

From: Norfolk, UK

Registered: 2013-12-01

Posts: 5,776

Re: /dev/mmcblk0 SD card not mountable, wrong fs, bad option

Have a look at photorec.

https://wiki.archlinux.org/index.php/File_recovery

Last edited by Slithery (2014-07-28 20:58:52)

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toogy

Member

Registered: 2013-10-25

Posts: 46

Re: /dev/mmcblk0 SD card not mountable, wrong fs, bad option

@Awebb: done

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berbae

Member

From: France

Registered: 2007-02-12

Posts: 1,304

Re: /dev/mmcblk0 SD card not mountable, wrong fs, bad option

Look to the package TestDisk https://www.archlinux.org/packages/extr … /testdisk/

4fg4n

Member

Registered: 2019-05-19

Posts: 5

Re: /dev/mmcblk0 SD card not mountable, wrong fs, bad option

maybe you forgot to make the fs?
mkfs.ext4 /dev/mmcblk0p1 #exactly like when you installed arch-linux
lsblk --fs #now must show a ext4 fs in the partition 1
try to mount it

seth

Member

From: Won't reply 2 private help req

Registered: 2012-09-03

Posts: 78,513

Re: /dev/mmcblk0 SD card not mountable, wrong fs, bad option

The thread is 5 years old. Please don't necrobump.

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V1del

Forum Moderator

Registered: 2012-10-16

Posts: 25,423

Re: /dev/mmcblk0 SD card not mountable, wrong fs, bad option

Indeed. Closing.