LIST OF HARD DISKS WORKING IN DP7100/7200

Maxtor 7200 RPM 27.2 GB ATA/66 Model #92732U8. Reported around 19 hours of recording time.
Maxtor 7200 RPM 20 GB ATA/66 Model #92049U6. Reported around 24 hours of recording time.
Maxtor 5400 RPM 40 GB Model #94098U8 Kit #K0194000U.
Maxtor 5400 RPM 27.2 GB Model #K0192720U.
Maxtor 5400 RPM 30.7 GB ATA/66 Model #93073U6.
Maxtor 5400 RPM 36.5 GB Model #93652U8. (FYI This seems to have been a really popular drive to upgrade with)
Maxtor 5400 RPM 46 GB Model #93652UB. Reported around 28-29 hours of recording time.
Maxtor 17.2GB ATA/66 Model #91826U4.
Maxtor 17.4GB Model #91741U4.
IBM Deskstar 37.5 GB Model #31L9070.
IBM Deskstar 5400 RPM 25.0 GB Model #25L2652.
Western Digital 5400 RPM 30GB Model #WD307AA.
Western Digital Expert 7200 RPM 27.3 GB Model #WD273BARTL.
Seagate 7200 RPM 20.4 GB Model #ST320430A.

Note: You must have Personal TV service to record to the Hard Disk.  You can only record 15 minutes, as a demo, without the personal TV option.  You can only pause Live TV for a half hour.  Basically, if you do not have personal TV, there is no sense in the upgrade.