19 Sep
1998
19 Sep
'98
3:15 p.m.
In PC's, I always use 1.44 meg disks in 720k drives. I just tape over the
second hole, and format them in one of my 720k machines. I have one of
these "doctored" disks that is 5 years old, and still holding its original
data strong and true. It has even been around magnetic fields (slit off
monitor onto back, right above coil), and hasn't lost a byte.
--
-Jason
(roblwill(a)usaor.net)
ICQ#-1730318
----------
From: Chuck McManis <cmcmanis(a)freegate.com>
To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
Subject: Re: High density disks on double density
drives
Date: Saturday, September 19, 1998 2:41 PM
It is neither the drive nor the controller per-se, it is the read/write
heads and the media that are incompatible. HD disk media requires a
higher
magnetic field to magnetize reliably and the DD drives
don't provide it.
--Chuck
At 01:36 PM 9/19/98 -0500, you wrote:
>I've heard that you shouldn't use high density disks in double
>density drives, that the data wouldn't be reliable.
19 Sep
19 Sep
4:17 p.m.
Jason Willgruber wrote:
In PC's, I always use 1.44 meg disks in 720k drives. I just tape over the
second hole, and format them in one of my 720k machines. I have one of
Going from memory, the orstead rating for 360K diskettes is 300, 1.2M is
600, 720K is 600, and 1.4MB is 700. As such, the difference between 720K
and 1.44 MB is marginal but will still work. It is more common to take the
720K diskettes and punch a new hole in them to use them as 1.44. As you can
see though, the difference between 360K and 1.2 MB is much greater, and at
best is not reliable. There have been many discussions about this over the
past 15 years or so.
Another area of controversy is using 360K disks to transfer information
between 1.2 and 360 drives. Nutshell description: if the diskette has been
bulk erased and formatted and information written by the 1.2 (of course
using the /4 or f:360 switch), it will work fine. Once a disk has been
written to by the 360K disk, writting to it again with the 1.2 can
frequently result in an unreadable disk on a 360 drive.
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