31 Aug
2001
31 Aug
'01
9:32 a.m.
On Fri, 31 Aug 2001, Don Maslin wrote:
On Fri, 31 Aug 2001, Richard Erlacher wrote:
Oops! Obviously, I meant and should have said "double-sided drive".
- don
Well, if the written spec's can be believed,
you can't SEE the difference
between DD and SD media. That doesn't change the fact that they have different
spec's. Further, DS media are certified on BOTH sides, while the emulsion on
one side may be defective.
It's true that DS media have their index hole located differently than SS media.
The index timing is different, according to some drive makers, albeit not VERY
different. At least one mfg spec's the DS drives with 160 microsecond +/- 50
from the start of /Index to the data burst, while SS media are at 200. I've
never given much thought to this and how it affects things, but I am not
comfortable with the notion of switching, mechanically, between the two sensors.
Dick
Probably of little consequence, Dick, since his DSDD disks will not be
readable by anyone else unless the have performed the same modification
to a single-sided drive.
- don