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Old 21st April 2012, 02:04 PM
infinus Offline
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Posts: 10
linuxfirefox
mmcblk0 is write-protected, mounting read-only >>

Hi all,

I am not able to format or partition MMC card from my fedora 14.

here is dmesg | tail

[ 96.857890] mmc0: new SD card at address 0002
[ 96.860501] mmcblk0: mmc0:0002 N/A 1.87 GiB (ro)
[ 96.865958] mmcblk0: p1
[ 97.349232] SELinux: initialized (dev mmcblk0p1, type vfat), uses genfs_contexts
[ 151.227401] SELinux: initialized (dev mmcblk0p1, type vfat), uses genfs_contexts
[ 848.017403] FAT: bogus number of reserved sectors
[ 848.017414] VFS: Can't find a valid FAT filesystem on dev mmcblk0.


here is when i do fdisk /dev/mmcblk0
You will not be able to write the partition table.

Command (m for help): d
Selected partition 1

Command (m for help): w

Unable to write /dev/mmcblk0


this is perfectly new memory card. i am able to format it on windows and copy/ cut and paste from/ to mmc.

and when i am trying to mount: # mount -rw /dev/mmcblk0
mount: can't find /dev/mmcblk0 in /etc/fstab or /etc/mtab



here is: cat /etc/fstab

#
# /etc/fstab
# Created by anaconda on Mon Mar 5 22:07:47 2012
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
UUID=df36ddbe-489f-453e-a1f2-abf6ae7a3ba5 / ext4 defaults 1 1
UUID=b944005a-c184-4e67-9d16-80396e935b3c /home ext4 defaults 1 2
UUID=389e7620-41bb-47e5-a92c-cd418eff99a3 swap swap defaults 0 0
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0



here is: cat /etc/mtab
/dev/sda1 / ext4 rw 0 0
proc /proc proc rw 0 0
sysfs /sys sysfs rw 0 0
devpts /dev/pts devpts rw,gid=5,mode=620 0 0
tmpfs /dev/shm tmpfs rw,rootcontext="system_u:object_r:tmpfs_t:s0" 0 0
/dev/sda2 /home ext4 rw 0 0
none /proc/sys/fs/binfmt_misc binfmt_misc rw 0 0
capifs /dev/capi capifs rw,mode=0666 0 0
sunrpc /var/lib/nfs/rpc_pipefs rpc_pipefs rw 0 0
fusectl /sys/fs/fuse/connections fusectl rw 0 0
gvfs-fuse-daemon /home/ashwini/.gvfs fuse.gvfs-fuse-daemon rw,nosuid,nodev,user=ashwini 0 0


uname -a
Linux dubey.labs 2.6.35.6-45.fc14.i686 #1 SMP Mon Oct 18 23:56:17 UTC 2010 i686 i686 i386 GNU/Linux



can some one help..
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  #2  
Old 22nd April 2012, 03:11 AM
JohnJasonJordan Offline
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Location: Portland USA left coast
Posts: 254
linuxfirefox
Re: mmcblk0 is write-protected, mounting read-only >>

What kind of computer/card are you inserting the card into?
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  #3  
Old 22nd April 2012, 04:11 AM
infinus Offline
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Join Date: Sep 2010
Posts: 10
unknownsafari
Re: mmcblk0 is write-protected, mounting read-only >>

Computer: HP DV6114X Notebook PC, 1.6GHz dual core, 2GB ram, inbuild 5 in 1 card reader.
Memory card: 1. SD card, MicoSD card. (Both of them are readonly appeard to linux), windows 7 can read and write to both card.
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Old 22nd April 2012, 05:14 AM
JohnJasonJordan Offline
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Join Date: Mar 2007
Location: Portland USA left coast
Posts: 254
linuxfirefox
Re: mmcblk0 is write-protected, mounting read-only >>

Quote:
Originally Posted by infinus View Post
Computer: HP DV6114X Notebook PC, 1.6GHz dual core, 2GB ram, inbuild 5 in 1 card reader.
Memory card: 1. SD card, MicoSD card. (Both of them are readonly appeard to linux), windows 7 can read and write to both card.
OK, let me offer my experience.

I have a Thinkpad T61 with a Ricoh card reader. I was never able to get it to mount any media read/write. All I could get was read-only. The same media mounted read/write everywhere else - Windows, MacOS, Android phone, other Linux computers. After much messing around the card reader eventually failed altogether. I started trying to get this working with Fedora 14, currently Fedora 16, x86_64.

My point is that you should not discard the notion of hardware failure. The Ricoh card reader is famous all over the net for being junk.

I haven't replaced mine because it would cost $25 just for the part. Instead I got a USB 5-in-1 from Fry's for $4.90. Works like a champ.
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