External hard drive does not work

I bought an external USB hard drive. At first, it worked. I could see an icon on my desktop and could load some stuff onto it.
Then I unplugged it (probably the wrong way, I just unplugged it) and when I replugged it, I could not see the icon anymore and when I go into the system specification/USB specs, I cannot see anything plugged in the port.
When I plug the drive in my old iMac, it work. I can see the icon AND the stuff that was previously loaded on the drive.
What should I do?
Thanks
iBook G4 Mac OS X (10.4.7)

The case's chipset(s) probably limit the size of drive/partition it can use.
If you need a larger drive than the case originally held, you probably need
to get a newer external drive enclosure that supports a newer/larger drive
of the type and kind you need.
As to the other issue ahead of this; if the hard drive in use is not discon-
nected properly, damages can result and you may need to use disk repair
tools or utilities to see if they can find the drive or fault behind this issue
and repair it. Maybe diskwarrior; or perhaps even the disk utility in the OSX
version the problem happened to occur. If there is a bad sector or startup
section in the suspect drive, it may be possible to find the drive using a
utility and see if it can be fixed; or it may need to be reformatted.
Pulling the plug on an attached drive is a bad idea; you need to drag the
icon of the external drive to the Trash, or use the finder's eject feature
to unmount these drives. They are not randomly hot swappable.

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