Mac no longer recognizes external disk

I have an external disk that I reformatted in FAT32 as I share it with an old PC while I am doing file transfer from PC to Mac. This worked fine for a week and then today all of a sudden the Mac told me I should nt remove the external disk ( I had nt touched it. it was still connected via the USB port) and since then it no longer "sees" the external disk. However the PC continues recognizing it. I have swithched everything off, plugged and unplugged, but no success. HELP!

I did that.
But nothing happens. I guess cmd e doesn t do anything if the Mac doesn t realize that I have an external disk connected!
I have eliminated all hardware pbs in my reasoning. Am I right?
- disk is ok as it is visible to PC
- cable and connector are OK as external disk works with PC
- FAT32 format is ok as it was readable by Mac for a whole week. (and it stopped suddenly while I was n t even accessing disk and the disk disappeared from Finder AS IF I had pulled out the USB port without disconnecting. Mac even ACCUSED me of doing so on screen)
- Mac USB port is ok as I use it with camera
Any other suggestions? Should I take the apple to a store? It is only one month old so under guarantee

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