My PC thinks portable hdd is a cd-rom drive, how can I fix this?

I bought an external 1.8 inch enclosure for a hard drive online. I took the hard drive from my old mp3 and put in it. Fits perfectly and all that. Its a toshiba hard drive. The manufacturer said that this enclosure was for 1.8 inch toshiba drives.

But any time I try access the drive, my laptop thinks that its a CD drive and asks me to insert a disk.

Does anyone know how I can fix this? Or perhaps uninstall whatever drivers it found?