16 Oct
2009
16 Oct
'09
4:40 a.m.
On Thu, 15 Oct 2009, Chuck Guzis wrote:
On 14 Oct 2009 at 18:10, Steven Hirsch wrote:
Hmm. There was a limitation somewhere that the WD20xx series corrected.
Number of heads, perhaps? Or am I confusing things totally?
--
IIRC, they required the WD2010 controller due to
some limitations of
the WD10xx series.
It was a BIOS software limitation, pure and simple. The "standard"
INT 13H BIOS interface calls for a 10-sector cylinder number (8 bits
in CH and 2 "borrowed" bits from the sector number register in CL).
Some late BIOSes (such as those on the WD1006VSRx) expanded the
cylinder number by borrowing some bits from the head number in
register DH.