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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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What happened to my hard drive?
On Wednesday, May 18, 2011 3:34:55 PM UTC-7, Meat Plow wrote:
The BIOS should recognize a drive regardless of the state of the drives partitioning, formatting etc. The BIOS via int13 says hello to the drive's electronics and it reports back its CHS, LBA etc.. If this doesn't occur it is a problem with the drive electronics. The relevant issue, though, is that the drive in question was growing bad sectors; even a 'good electronics' drive might NOT pass power-on self test and will tell the control software NOTHING useful, when the wear of years stops it from reliably reading the magnetic info. |
#2
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What happened to my hard drive?
On Fri, 20 May 2011 08:47:32 -0700, whit3rd wrote:
On Wednesday, May 18, 2011 3:34:55 PM UTC-7, Meat Plow wrote: The BIOS should recognize a drive regardless of the state of the drives partitioning, formatting etc. The BIOS via int13 says hello to the drive's electronics and it reports back its CHS, LBA etc.. If this doesn't occur it is a problem with the drive electronics. The relevant issue, though, is that the drive in question was growing bad sectors; even a 'good electronics' drive might NOT pass power-on self test and will tell the control software NOTHING useful, when the wear of years stops it from reliably reading the magnetic info. Depends if the controller and BIOS are getting the info from NVRAM or an engineering track on the platter. Don't know when this came about but probably not back in a 40 GB drive. And apparently not when drives were 160 GB, Seagate Barracuda 7200 rpm. I've swapped electronics on two identical drives one making some seek noises and constant clicking, and one that was dead. I revived the dead drive and it worked fine for a year. Both drives had run continuously in DVRs for at leat 2 years. So not knowing which brands and models handle engineering data and when they switched over if they did puts me at a disadvantage. I'm just trying to develop the overall picture logically but will end up doing some actual reading. -- Live Fast Die Young, Leave A Pretty Corpse |
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