Topfield TF 5510 PVR - Manual (Page 93)

7.8 Formatting the hard disk 87
CAUTION
Formatting the hard disk will delete all files permanently.
NOTE
If a new hard disk drive is installed, it must be formatted
because the file system of the digital receiver is different from
any of the personal computer. You can neither record nor use
time shift with an unformatted hard disk.