WD  My DVR Expander 500 GB eSATA External Hard Drive 500GB maximum storage capacity (up to 300 hours of SDTV; up to 60 hours of HDTV) eSATA interface - Enjoy rapid data-transfer rates up to 3 GB per second 7200 rpm for fast read/write times Soft amber LED screen is easy to read and helps avoid annoyance at night Cool operation