Can you list some of the programs that display this fault? There is an issue with recordings of certain programs that exhibit similar symptoms.
Why do you want a Linux program to check the disk? Humaxcheck (by the same author as Humaxrw) will tell you if the file system has problems and provides some tools to correct errors.
Thanks for the prompt replies, much appreciated. I may not be able to respond quickly in future, but I shall do so as soon as possible.
The new link works, downloaded OK and will try it when I can, thanks. And I hadn't thought of using Humaxcheck - will do so when I have copied from one disk to the other.
I have seen mention of consistent problems with certain progs, not sure that is the reason here; the unwatchable recordings are progs which don't normally cause problems to me like BBC2 Horizon, BBC4 Sky at Night. They are present on the disk and the space used looks about the correct amount for the length of the programmes. There are 7 consecutive, BBC2, BBC3, ITV1, C4, BBC4, BBC2, BBC2 about 6 weeks ago and a few subsequently. We had 2 others like this about 12 months ago, and several since then which play and are watchable, but jump bits which can be seen on fast forward/back or slow; they include some E4 and ITV4 (Tour de France) as well as the other channels. If one pauses during fast forward in an unwatchable portion, and then starts to play, sometimes it is OK - but usually it just jumps to the end of the 'bad' bit. If one tries again later (days or weeks) it is still like this. The bad ones I have NOT deleted so that part of the drive isn't reused. What was noticeable is that the 7 consecutive recordings were when the disk had more stuff on it than ever before (but still about 20% free then), so I would think the recordings would go on adjacent sectors of the disk which had not been used before. We had also experienced a power cut before when preset recordings could not be made, and although I cannot be sure now since it was some time ago, it may well have happened whilst recording was taking place. We have deleted recordings which jumped a little, and I suspect other problem recordings may be over those same sectors.
So I think a complete wipe, error check and format of the disk is called for. Shall report back when achieved.
Have done this with 'problem' disks using FAT & NTFS on PC's, and unless there is actual physical damage the drive is (usually!) restored to good health. It's important to completely erase all the disk, including the MBR area, starting with something like dBan nuke & boot. The disk manufacturers software can be used, but some more recent offerings don't tell you much about what is happening and you don't know if all the disk is being treated. So blanking everything out before starting with dBan is worth doing. It'll work on a USB disk from the bootable CD, but try not to delete the computer drives by mistake! I disconnect them (power lead is enough) just in case!
Low Level formatting (with something like the old PowerMax from Maxtor - which will work on non-Maxtor disks IF there's a Maxtor disk also installed) is good because it can ignore bad sectors, but the Seagate equivalent doesn't have the same brutality about it so I'm not sure if it gets at the MBR. And I haven't tried PowerMax on SATA drives - would have to fit a SATA to PATA converter for use with my PC. That would probably do it, so I might buy one, about £5 from Hong-Kong.
Even with the last (July2011) OTA software upgrade, my 9300T still misses the first few seconds from some progs (always with Dr. Who, Saturdays broadcast), and the last few seconds sometimes - not usually enough to be troublesome, and inconsistent. It hasn't really improved matters. We sometimes set it to record consecutive programs and removing the auto timings feature and adding (say) 5 mins can cause problems with ovelaps, as we know. So the software is still not right. Note that we also use a Panasonic DVD / VHS digital recorder [without a Hard Drive - that's the Humax's job] which has has no means of removing the auto timing feature BUT never gets it wrong - always starts and finishes correctly. I have recorded the same programme on both devices to test, and the Panasonic always gets it right even when the Humax cuts off. So it's not the way the signal is transmitted, the problem is within the device.
Enough for now, I'm not always this verbose, trust me!
David