Check that your model is compatible on WD web site.

Buy drive from WD.

plug in drive to power.

Plug supplied eSATA cable to drive and Motorola DVR.

Immediately tv screen asks if you want to format (yes).

Wait 5 seconds.

Use. Everything works the same. Drive will only work with the one dvr that it is “formatted” for.

Increases storage space by about ten (240 hours of HD).