VOGONS


First post, by vetz

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I just acquired an XT clone machine with a DTK 10mhz turbo board, 640kb RAM (turned out one of the RAM chips was bad, so just 256kb at the moment), EGA, serial and MFM + floppy controller. It also came with a nice Commodore PC10 case with 2x BASF AG 360kb 5.25 floppy drives and an IBM 0665-53 44MB MFM harddrive (came originally with the IBM 5170).

Once I figured out the RAM issue I tried to get the computer booting. I managed to boot DOS 3.3 from floppy, but the harddrive just refuses to either boot and reformat itself (boots up with 1701 UNFORMATTED HARD DISK ERROR). It also gives out quite strange initialization noises as can be seen in this video:

https://www.dropbox.com/s/249c5m3x6gxwq0b/201 … .37.46.mp4?dl=0

I've tried the low level format through the MFM controller BIOS and starting through DOS debug.com. I've also tried to park the heads and turn off and then back on again. I've let the machine idle for quite some time incase letting the drive heat up would solve the issue.

Do anyone know what could be the issue with this hard drive? Is it repairable? I haven't opened up the lid on it, but it shouldnt be much of a problem if needed.

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Reply 1 of 2, by Jo22

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Ouch. That ping noise doesn't sound too healty..

Anyway, perhaps the old drive is unable to find the "beginning" of the disk.
I had this issue quite a few times. It also happened even though I was using the park program..

(By the way, not all parking programs were the same. Some were made for a speciic fixed disk model,
ie, they were hard-coded to land the r/w heads on a specific cylinder. Universal programs were available, too.
I believe Central Point's PC-Tools included one, as well.)

In case my MFM drive got "stuck" in the process of finding its starting track,
it sometimes helped to switch off power at the moment it did a seek.

When I quickly switched it on again, it successfully finished the re-positioning.
Anyway, this is a dangerous method. It could also hurt the power supply.

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Reply 2 of 2, by Eep386

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^ Sounds like one of the heads in the drive is bad, that's why you get that repeated 'pinging' sound. The drive's processor is trying to get a track ID from that head and failing, and in so doing it rezeros the headstack against the crash stop before retrying, which is what makes that repeating ping noise. Judging by the really rough spin up spindle sound, I'd wager that's the least of this drive's problems.

Depending on which head it is, there's a very small chance you could just format the drive minus that head, and accept a loss of capacity, but I wouldn't put a lot of money on it. For example, if it's the very last logical head that's bad (and it's not the servo head), then you might be able to just format it with the head count reduced by 1. If it's any other head, I'm not so sure what you could do.

Life isn't long enough to re-enable every hidden option in every BIOS on every board... 🙁