Re: USB flash drives won't mount

On Sunday 13 May 2007 20:28, Mikkel L. Ellertson wrote:
David Fletcher wrote:

You may want to run, as root, "fdisk -l" and see if the flash drive
is detected. Depending on the partition type, and if the disk has a
label, it may be getting detected, but not auto-mounted. I have a CF
card that works that way:

Disk /dev/sda: 8 MB, 8028160 bytes
2 heads, 32 sectors/track, 245 cylinders
Units = cylinders of 64 * 512 = 32768 bytes

Device Boot Start End Blocks Id System
/dev/sda1 * 1 245 7824 4 FAT16 <32M

But another card in the same reader mounts no problem:

Disk /dev/sda: 15 MB, 15990784 bytes
4 heads, 32 sectors/track, 244 cylinders
Units = cylinders of 128 * 512 = 65536 bytes

Device Boot Start End Blocks Id System
/dev/sda1 * 1 243 15536 1 FAT12

I suspect that if I ever get around to reformatting the 8 MB card as
a FAT12 card, it will mount properly also...

While this will not solve your problem, knowing if the system
detects it, and if so, how it sees the drive, should help point to
the problem. But if you are in a hurry to get it working, you may be
able to solve the problem giving the drive a "name". For an ext2/3
partition, e2label works. For a FAT partition, it is easy to do in
Windows, but I am not sure how to do it in Linux except on a new
partition. (mkdosfs -n option.)

Mikkel

I get:-

<start>
Disk /dev/sda: 200.0 GB, 200049647616 bytes
255 heads, 63 sectors/track, 24321 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sda1 * 1 1211 9727326 7 HPFS/NTFS
/dev/sda2 1212 24320 185623042+ f W95 Ext'd (LBA)
/dev/sda5 1212 3123 15358108+ b W95 FAT32
/dev/sda6 3124 3136 104391 83 Linux
/dev/sda7 3137 24320 170160448+ 8e Linux LVM

Disk /dev/dm-0: 172.1 GB, 172100681728 bytes
255 heads, 63 sectors/track, 20923 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/dm-0 doesn't contain a valid partition table

Disk /dev/dm-1: 2080 MB, 2080374784 bytes
255 heads, 63 sectors/track, 252 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/dm-1 doesn't contain a valid partition table

Disk /dev/sdb: 2063 MB, 2063073280 bytes
16 heads, 32 sectors/track, 7870 cylinders
Units = cylinders of 512 * 512 = 262144 bytes

Device Boot Start End Blocks Id System
/dev/sdb1 * 1 7870 2014704 e W95 FAT16 (LBA)
<end>

The last device, /dev/sdb1 appears to be my USB flash drive.

I've used windows to name the drive, which is the name given (in all upper
case) to the desktop icon when I mount it using my son's computer. But it
still won't work as it did a day or two ago on my computer, so I conclude
that something got broken in the last batch of updates.

Dave

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