Repair 4GB SD card
- From: Garry Knight <garryknight@xxxxxxx>
- Date: Sun, 25 Feb 2007 01:24:43 +0000
I'm not sure if this is the correct group so if it isn't I'd appreciate it
if someone would suggest a more appropriate one.
As the price was very low, I recently bought a 4 GB SD card with the
name "KeyMem". I wanted to see if it worked with my iPAQ rx1950 Pocket PC
and, if it didn't, I intended to use it in my camera.
So, running Mandriva 2007 Free, I backed up my old 2 GB card then copied the
contents onto the new 4 GB card. The space used on the new card was just
under 2 GB. I then tried to copy (using Midnight Commander) a few podcasts
onto the card which would take the total space used just over 2 GB. It
failed on one of the files and asked if I wanted to keep or delete the
partial file. I chose to delete it.
From that point on, the card has been unusable. The Pocket PC acts as if Ihaven't put a card in the slot. My camera refuses to even power up with the
card inserted. And while fdisk acts as if it has created a partition, when
it tries to write this partition it fails saying that the device is in use.
Here are the commands I used:
----------------------------------------------------------------------
[root ~]$ fdisk /dev/sdc
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF
disklabel
Building a new DOS disklabel. Changes will remain in memory only,
until you decide to write them. After that, of course, the previous
content won't be recoverable.
Warning: invalid flag 0x0000 of partition table 4 will be corrected by
w(rite)
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-1023, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-1023, default 1023):
Using default value 1023
Command (m for help): t
Selected partition 1
Hex code (type L to list codes): c
Changed system type of partition 1 to c (W95 FAT32 (LBA))
Command (m for help): v
3529 unallocated sectors
Command (m for help): p
Disk /dev/sdc: 3963 MB, 3963617280 bytes
122 heads, 62 sectors/track, 1023 cylinders
Units = cylinders of 7564 * 512 = 3872768 bytes
Device Boot Start End Blocks Id System
/dev/sdc1 1 1023 3868955 c W95 FAT32 (LBA)
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
WARNING: Re-reading the partition table failed with error 16: Device or
resource busy.
The kernel still uses the old table.
The new table will be used at the next reboot.
WARNING: If you have created or modified any DOS 6.x
partitions, please see the fdisk manual page for additional
information.
Error closing file
[root ~]$
----------------------------------------------------------------------
While I've used a lot of flash cards of various kinds, I don't know much
about the technology behind them. For example, I don't know if the generic
USB2.0 card reader/writer I'm using can handle cards of 4 GB in size, or
whether only the newer ones can, or if they all can (I assumed the latter).
Also, it's not obvious whether it's an SD card or an SD-HC card, though the
label on it says "SD card", and I don't know if it makes a difference which
kind it is.
I hope I've given enough information to allow someone to answer the
question: Is this card repairable? And if so, how?
--
Garry Knight
garryknight@xxxxxxx
.
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