usb disk formatting problem

[misuk11]

I have a seagate 300mb external usb disk drive that was perviously connected to my old pc (windows xp). Due to a disk problem I had to format it for use with an apple macbook. I now no longer need it for the apple and want to use it with my new windows 7 machine. After connecting the disk, its recognised but I cant access it at all. I want to reformat it, but I dont have the option, in computer manager it doesnt even show up, yet it is in devices & printers. Im new to windows 7, so can anyone help me out ?

 

[FZ21Z]

This might help - http://www.sevenforums.com/tutorials/52129-disk-clean-clean-all-diskpart-command.html

 

[misuk11]

the problem is the disk doesnt appear . in the list despite appearing in devices

 

[whs]

Go to Disk Management (start > right click on Computer > Manage), then right click on the disk and assign a drive letter - or make a quick format with drive letter assignment. Make sure you choose NTFS.

 

[misuk11]

the disk doesn't appear in the list of drives in disk management, but it does appear in the list of devices (if I unplug it, it then disappears from the list)

so I cant select it to format it.