External drive problem

I used a Seagate Expension Portable Drive on my XP for years with no
problem. Then one morning it failed to work. Tried it in another connector
for my working flashdrive. Didn't work there either. It appears on the
drive list momentarily when I plug it in, then disappears.

I tried it in another XP machine and it works fine.

Guesses? Suggestions? I'd like to get it working again rather than the
expense of buying another drive and copying all the desired files to it.
And another drive may not work either.

TIA

--
I love a good meal! That's why I don't cook.