Well I've had the use of a 9200 with 160GB disk and one with a 320GB disk, bought at different times and they both exhibit the same fault.
I've formatted the disks several times and the fault returns within a few days.
It is made worse by recording two things at once, worse still by attempting to chase play one of the recordings, and by using the PiP stuff.
The first sign that things are wrong is that some of the programme lengths are wrong when replaying.
It often crashes following this.
If you carry on, it often puts duplicate items in the programme list. If you attempt to delete one of these, all hell can break loose.
I've had it recording over previously recorded programmes - sometimes having stopped it recording and then replaying, it will switch from the bit of new programme to the bit of old programme... think of recording over something on tape.
I took the disk out and put it in the PC and HumaxRW told me there were several programme entries referring to one file. Also, some files had no programme entry at all.
This is all very symptomatic of DOS FAT filesystems from 2o-30 years ago - think cross-linked files and lost clusters.
I stand by made experience. YMMV.