WD 2500xmse-00 What do I have

Acquired this WD  Portable HD model # above need to download drivers and don’t know

what this is called.  S/N [Deleted] R/N A48  2108A.

Thank you

http://support.wdc.com/product/download.asp?modelno=WDXMSE2500TN&x=0&y=0

Heres the link on the available downloads for your drive,