my usb pendrive is nt getting detected.plz help me.this is what i get after i type on terminal dmesg | tail
[ 2241.907725] sd 8:0:0:0: [sdb] Write Protect is on
[ 2241.907730] sd 8:0:0:0: [sdb] Mode Sense: 23 00 80 00
[ 2241.907734] sd 8:0:0:0: [sdb] Assuming drive cache: write through
[ 2241.911706] sd 8:0:0:0: [sdb] 501760 512-byte hardware sectors (257 MB)
[ 2241.912333] sd 8:0:0:0: [sdb] Write Protect is on
[ 2241.912336] sd 8:0:0:0: [sdb] Mode Sense: 23 00 80 00
[ 2241.912338] sd 8:0:0:0: [sdb] Assuming drive cache: write through
[ 2241.912345] sdb: unknown partition table
[ 2241.915034] sd 8:0:0:0: [sdb] Attached SCSI removable disk
[ 2241.915091] sd 8:0:0:0: Attached scsi generic sg2 type 0
and whn i type sudo fdisk -l /dev/sdb
Disk /dev/sdb: 256 MB, 256901120 bytes
8 heads, 62 sectors/track, 1011 cylinders
Units = cylinders of 496 * 512 = 253952 bytes
Disk identifier: 0x00000000

Disk /dev/sdb doesn't contain a valid partition table
is what i get.plz help me out.

I can't help you with your direct question, but I would have thought that if this was genuinely urgent that you would have done less to put people off from answering your question.

Your title is not what we would consider a helpful one (it should at least mention that it is a USB pendrive issue, and 'help me', a series of question marks and 'its urgent' are all individually things that will deflect some people who would otherwise like to help; combined I can only assume that these will put off many potential respondents).

Note also that text-ese and similar abbreviated forms (nt, plz, whn and the abuse of capitals) are against the rules of the forum, so that will put others off.

So, the question you have to ask yourself is, did you want a helpful answer?

Yeah posts with that title piss off a lot of people. I think I read "don't posts things like `help me` or `it's urgent`" like a thousand times when I registered.

And if it's on dmesg, your pendrive is obviously getting detected. As it says, it just doesn't find a working partition table. If you formatted it once or did a dd if=somefile of=/dev/sdb and changed the partition table, that happens sometimes. You may try unplugging it and plug it back or restart the computer. Otherwise your pendrive is probably just broken, bad luck.

lulz, ur dsk needz 4matign.

Annoying, isn't it. Whack write protection off, and take a look at , it'll help you format your pendrive. If there is anything important on there, its fixable, but to be honest, its not easy to do; you may feel better sacking it off.

If you don't want to use fdisk, there are many graphical front ends.

from your post it looks like your flashdrive is being detected by Linux but is not mounting.

First try mounting the raw /dev/sdx device (e.g. mount /dev/sdb /mnt/point).

If that fails, you can try running fsck on the raw device, not on a partition. From the output of your dmesg it looks like the drive does not contain a partition table, but it's possible a filesystem exists without the use of a partition table at all (some drives are formatted this way, even though it's not standard nor recommended practice!).

If this drive works anywhere else, like on a Windows box, I'd recommend backing up all data, using Linux to partition it with a single FAT partition and then copying data back.

fm