Dear Mukund JB:
It seems to me that the partition table is in error.
My digital camera formats my CF media as a single fat12 partition.
Both 'sfdisk' and 'fdisk' report a partition error on the first partition.
I am still wondering if your two SD media cards were originally
formatted with four (4) partitions as 'sfdisk -l' displays?
I would like to assume that both cards were originally formatted
with a single fat12 partition.
more comments inline...
Mukund JB. wrote:
Dear chem.,
See my inline comments.
I have an SD card problem that mounts when formatted on windows but
fails when formatted on camera as you all know.
Now, I an able mount the SD card formatted using the DIGITAL CAMREA
on
Linux box using the windows formatted SD cards first 512 bytes.
Uh, which is it?
"formatted using the DIGITAL CAMREA"
or
"windows formatted SD cards"
The SD car that is formatted in windows is mounting but the SD card
formatted in Digital CAMRA is NOT mounting.
Is the SD card formatted by the camera or by windows?
What is the result of "fdisk -l" of this SD card?
#fdisk -lV /dev/tfa0 (both camera & windows are same result)
Disk /dev/tfa0: 448 cylinders, 2 heads, 32 sectors/track
Units = cylinders of 32768 bytes, blocks of 1024 bytes, counting from 0
Device Boot Start End #cyls #blocks Id System
/dev/tfa0p1 * 0+ 449 450- 14371+ 1 FAT12
/dev/tfa0p2 0 - 0 0 0 Empty
/dev/tfa0p3 0 - 0 0 0 Empty
/dev/tfa0p4 0 - 0 0 0 Empty
Warning: partition 1 extends past end of disk
Thanks. It seems to me that this partitioning is different or wrong.
Let us see what filesystems are present on the cards:
fdisk -T /dev/tfa0p1
Does your linux system support filesystem type fat12?
more...
I recall that you are using 'sfdisk' and that it reported an error
in the partitioning scheme of that SD card.
Of less significance: How did the partitioning get corrupted?
Did it happen after using 'sfdisk' to modify the SD card's partitions?
The SD card that is formatted on DIGITAL CAMARA is NOT mounting in
Linux.
It says:
#Mount -t /dev/tfa0 /mnt
FAT: bogus number of reserved sectors
Mount: wrong fs type, bad option, bas superblock on /dev/tfa0,
or too many mounted file systems
I have used the mount command's -t option with an argument; i.e.
auto, fat12, iso9660, ...
-and-
you did not specify which partition to mount; i.e.
mount -t fat12 /dev/tfa0p1 /mnt/mountpoint
^^
I would expect your mount command to fail due to these two omissions.
more...
So, I tried the sfdisk -lV to know the configuration. However, sfdisk is
a read-only command & it will NOT alter the partition table.
I believe that 'sfdisk' is capable of altering a partition table.
From 'man sfdisk':
"Create partitions
The fourth type of invocation: sfdisk device will cause
sfdisk to read the specification for the desired parti-
tioning of device from its standard input, and then to
change the partition tables on that disk. Thus, it is pos-
sible to use sfdisk from a shell script. When sfdisk
determines that its standard input is a terminal, it will
be conversational; otherwise it will abort on any error.
BE EXTREMELY CAREFUL - ONE TYPING MISTAKE AND ALL YOUR DATA IS LOST"
The partition table is NOT corrupted as we are able to mount the SD card
on Windows.
If yes, perhaps using 'sfdisk' is not the appropriate application
to modify the SD card's partitions.
I am guessing that you may need to use a partitioning application
to restore the SD card to something that the camera will recognize.
I fear that the application to accomplish this is not 'sfdisk'.
HTH, Chuck
So, point here why it is mounting when I alter the first 512 bytes as
like windows formatted device using dd?
Because, using 'dd, you made the other SD media 'look like' the
windows formatted SD media.
What filesystem does your windows o/s put on the SD media?
fdisk -T /dev/tfa0p1
What filesystem does your camera put on the media?
fdisk -T /dev/tfa0p1
Does your linux system support the same filesystem as your camera ?
cat /proc/filesystems
Does your windows o/s format the SD media with the same filesystem as your
camera ?
HTH, Chuck
Regards,
Mukund Jampala
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