the Travelstar should work if it is connected correctly. Are you sure that it is a 10MB drive? If it is, trash it.
Boot from the CD with the drive installed and see if you can see it with the Disk Utility/Hard Drive Utility. It may be formatted strangely and just needs reinitialising.
I have an old G3 powerbook, I am wondering if a Travelstar 15GN (10MB) should work with it? It does not appear to recognise the disk (or any of a couple of others I have got lying around) but it boots ok from a CD and recognises RAM etc.
any info appreciated