9 Jun
2003
9 Jun
'03
4:36 p.m.
On Monday 09 June 2003 11:07 pm, Fred Cisin (XenoSoft) wrote:
On Mon, 9 Jun 2003, jamesd wrote:
my question was could a DSHD disk formated using 720k parameters on a
DSDD
drive be readable on a DSDD drive was the question... i know a DSDD disk is
readaple and formatable on a DSHD drive it just that a DSHD drive can't be
fooled to write a usuable DSDD disk by covering the whole or any other
message... because the media on the DSHD disk is different..
hi
To answer your question a true DSDD 3 1/2" drive can't read a DSHD,
because the media is differenent... so it can't read a disk formated in a
DSHD
No, a "DSDD" can't read a DSHD because
it is recorded at a higher density.
WHICH IS NOT THE DIRECTION THAT WE HAVE BEEN TALKING ABOUT!
The message that you just replied to was addressing the issue of whether
the 720K diskette could be formatted in an ordinary PC (specifically XP).
EVERY DSHD drive can read "DSDD" diskettes, so long as the disk controller
supports the lower (250K) data transfer rate, and the correct
software is present. That includes every disk controller that you have
ever seen, although Tony and a few others may have some that were
originally designed for 8" that do not support the lower rates.
drive... i can't even boot my laptop to test
if the reverse is true.
By the way i also have an excepted an offer from a fellow list member to
send me disks... witch i really appreciate...
NO manufacturer of a 3.5" HD drive has ever made an HD drive that
couldn't ALSO handle the lower density.
Yes, the media is different. The differences are: different chemical
coating to produce a slightly higher coercivity, and an extra hole in
the diskette to tell drives which diskette it is. Those are the ONLY
differences. NOTE: not all drives include the sensor to notice the disk
differences.
THEREFORE: as stated previously, the ability to FORMAT 720K in a 1.4M is
ONLY an issue of whether the SOFTWARE supports it, and if the harware is
"normal".