TIVO harddrives...defragmentation?

[jobfather]

Assuming the hard drives in a computer are similar to those in a TIVO capable DVR or satellite receiver, do the units in the TIVO boxes require defragmentation after a period of long or heavy use? I assume recorded programs are added and deleted the same as files on a computer hard drive. If so, how does one perform this maintenance???
From what I can glean about my DIRECTV TIVO unit, the only option is to reformat the hard drive.

 

[teevee]

Most pvrs like Tivo have software built right on the drives that help defrag. If it acts up you can always buy a replacement. If your looking for Tivo drives check out www.thepvrsource.com. I think it's the only place in Canada where you can buy Tivo and Tivo drives.