Author Topic: 256SanDisk SD card is now read-only  (Read 921 times)

bMindful

  • Newbie
  • *
  • Posts: 11
    • View Profile
    • http://www.onematchfire.com
256SanDisk SD card is now read-only
« on: December 29, 2003, 08:10:08 pm »
Hi all,

I was using my SanDisk256 SD card fine, but now I cannot write any files to it either via Z file transfer (winXP) or directly via the Z (5500). My Z will open and play existing files on the SD card, but I cannot delete those files or write new ones.

From the terminal when I try and \'rm\' a file I am told \"unable .... Read-only file system.\" [Note the lock on the SD card is in the unlocked position]

I wonder if the file system has become read-only or is that a misreported error due to inability to write? Or is this more SanDisk product failure?

Anyone have any ideas? I am familiar with *nix & terminal, but just learning admin tasks, so I am unfamiliar with disk-related *nix functions. I have no problem wiping card and starting again. My Z is my only SD card device, so I can\'t read from other device

Thanks!

Ted Rheingold
SL-5500, Rom 3.10, Socket CF WiFi, SanDisk SD 256 RAM [winXP]

brewin

  • Newbie
  • *
  • Posts: 11
    • View Profile
    • http://
256SanDisk SD card is now read-only
« Reply #1 on: December 29, 2003, 10:06:36 pm »
If it really has become read-only somehow, you can add write permissions with this:
Code: [Select]
chmod [-r] +w /mnt/card

If that doesn\'t work, try formatting it with this:
Code: [Select]
umount /mnt/card

mkfs.vfat -F 16 /dev/mmcda1

mount /dev/mmcda1 /mnt/card
SL-5500 running Zynergy on kernel with wireless extensions
128MB CF, 32MB MMC
Socket Low Power WLAN Card

Matti

  • Newbie
  • *
  • Posts: 12
    • View Profile
    • http://
256SanDisk SD card is now read-only
« Reply #2 on: January 03, 2004, 07:58:25 pm »
If your sandisk 256mb card is anything like mine, it will have a little white switch on the side that  switches it from read/write to read only.  The read only setting is labelled \"Lock\" on the top, the other setting is unlabelled.  

It should be pretty obvious as there isn\'t much to see on an SD card, let me know if you want a photograph.  

M

Anonymous

  • Guest
256SanDisk SD card is now read-only
« Reply #3 on: January 04, 2004, 09:28:42 pm »
Just yesterday I experienced the same on my Panasonic 256mb SD.  I \"ejected\" the card by clicking on the small SD icon on the task bar.  Then take out the card and re-inserted it.  It mounted as read-write again.  I wonder what happened..?

wys

bMindful

  • Newbie
  • *
  • Posts: 11
    • View Profile
    • http://www.onematchfire.com
256SanDisk SD card is now read-only
« Reply #4 on: January 17, 2004, 10:13:17 pm »
Thanks all,

I was able to get the card back to functional again. For future readers, I step thru it.

-Once I remembered to switch to root (doh!),
-I couldn\'t chmod the card, I still kept getting a read-only error. So,
-I umounted, mkfs.vfat\'ed, mounted per brewins direction
-The SD card reponded now, but still failed at all write/read/delete commands.
- I ejected the SD, rebooted the Z, reinstered SD and now it\'s 100% back.

Thanks brewin and responders.
SL-5500, Rom 3.10, Socket CF WiFi, SanDisk SD 256 RAM [winXP]