Question about Toshiba Satellite 1905-S301 Notebook
I just need to know how big of a hard drive this model will handle with the stock BIOS that came with it. I have the adapter to the mainboard and I know it's an enhanced IDE ATA-5. It came with a 40 gig and I would like to get as big a drive as I can and still have the BIOS read it. Thank You!
The ATA-5 Specification barrier
According to the ATA specification, any drive over 7.88GB (8.46 billion Bytes) is supposed to report its "geometry" as 16383/16/63 (C/H/S). Which enables old software to access the first 7.84 to 7.88GB of such a drive, using CHS addressing and the BIOS Int 13h system call. And while a P-CHS over 16383/16/63 can be used to access all the drive capacity-- up to the ATA-5 128GB limit-- that is not the recommended way to do so. Rather, LBA addressing should be used to access those larger capacity drives. (Or at least any partition that goes over the 7.88GB BIOS Int 13h CHS barrier.)
So, LBA uses a 28 bit binary number to specify the sector number on a drive. Thus:
228 = 268435455 Sectors
268435455 Sectors x 512 Bytes/Sector = 137438952960 Bytes
Resulting in the 128GB (137.4 billion Bytes) ATA-5 size limit.
Posted on Nov 22, 2008
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Posted on Jan 02, 2017
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