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#1
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AT ATAPI Hard Disks
Hi,
Im trying to locate a specialist in hard disks, I need some information on physical disk geometry. I know that CHS addressing does not directly translate to physical track location, due to the fact that each track on the disk holds a different number of sectors from the previous as you work your self out from the centre of the disk. Do all AT disks use a similar physical addressing translation or is it specific to each vendors. Basicly I want to be write an algorithm that will alow me to address each track and the sectors on each track. Is this possible? Will hard drive manufactures give the details required to make this possible and will it have to be done seperatly for each vendors specific hard disk? BTW, is this the right place to ask this sort of question ? Thanks. |
#2
Posted to alt.electronics
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AT ATAPI Hard Disks
Hi,
Im trying to locate a specialist in hard disks, I need some information on physical disk geometry. I know that CHS addressing does not directly translate to physical track location, due to the fact that each track on the disk holds a different number of sectors from the previous as you work your self out from the centre of the disk. Do all AT disks use a similar physical addressing translation or is it specific to each vendors. Basicly I want to be write an algorithm that will alow me to address each track and the sectors on each track. Is this possible? Will hard drive manufactures give the details required to make this possible and will it have to be done seperatly for each vendors specific hard disk? BTW, is this the right place to ask this sort of question ? Thanks. http://www.ata-atapi.com/hiwchs.htm gives some information on the software/HD interface side of things, but I'm not sure that's going to be useful to you. My limited understanding is that the drives themselves convert from logical addresses to physical ones internally, and the drive geometry varies between drives, and is hidden from the O/S. Maybe it could be possible to determine the geometry by timing? |
#3
Posted to alt.electronics
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AT ATAPI Hard Disks
On 2005-12-12, Richard Harris wrote:
Hi, Im trying to locate a specialist in hard disks, I need some information on physical disk geometry. I know that CHS addressing does not directly translate to physical track location, due to the fact that each track on the disk holds a different number of sectors from the previous as you work your self out from the centre of the disk. Do all AT disks use a similar physical addressing translation or is it specific to each vendors. physical geometry is vendor (and posibly model or even unit) specific. CHS or LBA addresses may be translated in unpredictable eg for working around bad blocks. Basicly I want to be write an algorithm that will alow me to address each track and the sectors on each track. Is this possible? yes. the 2.6 linux kernel has rudimentary support for that sort of thing. Will hard drive manufactures give the details required to make this possible and will it have to be done seperatly for each vendors specific hard disk? possibly. BTW, is this the right place to ask this sort of question ? you could try alt.comp.hardware comp.hardware comp.ibm.pc.hardware comp.sys.ibm.pc.hardware.storage I have no idea how much traffic they get. Bye. Jasen |
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