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Where is the entry for R/W harddisk in the Wiki?

Thanks~

For some reason my connection is dreadfully slow right now so I won't go searching for it for you. Here are the keywords you should be looking for, and searching the wider internet will also help: UDMA, ATA, ATAPI and SCSI. If you don't understand all of them start with some background info (maybe from Wikipedia) and decide which are appropriate for your target machine.

doesnt look like there is anything generally about HDDs but...

and searching the wider internet will also help

for the common (ATA) HDDs, check out ATA-ATAPI

and for hardware resources of all types try:
OSRC