USB problem

[viking777]

Did you unmount them before you unplugged them?

If not then I am afraid you can only blame yourself.

Run chkdsk on them from windows.

[viking777]

Well if you have a pendrive that you haven't used on Linux that can't be detected by Windows then I would think you have a problem with Windows, not the pendrives. Anyway you can't damage a drive just by reading it from Linux, only if you unplug it without unmounting it first (Linux equivalent of 'Safely Remove Hardware'). If you have unplugged the Seagate without unmounting it first then it is possible you could have damaged it, but on the other hand if you saw no icon for it then maybe it wasn't mounted in the first place, in that case you are perfectly safe. Did you access the Seagate at all? (ie read from it or write to it?).

[viking777]

It probably does recognise it, have you had a look in the 'Places' menu or opened your file manager and looked for it in there?

Alternatively (only a temporary workround this) plug it in and run

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sudo fdisk -l 

In a terminal.

It should show up as /dev/sdb1 or something like that (depends on how many drives and partitions you have)

Once you know what it is called you can mount it manually with

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sudo mount -t vfat /dev/sdb1 /media/disk

But you will have to create a folder called /disk in /media first (it doesn't have to be called /disk you can call is anything you like). Also your filesysytem might not be vfat (fat 32) so check

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man mount

If it isn't..

Don't forget to unmount it before you unplug it

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sudo umount /media/disk