13 Feb
2013
13 Feb
'13
4:39 p.m.
------------------------------
On Wed, Feb 13, 2013 3:54 PM PST Fred Cisin wrote:
On Wed, 13 Feb 2013, Chris Tofu wrote:
> and Scott more often then not DD media will format fine as "quads". They
> may not last as long as 96tpi media, depending on the quality.
correct!
It is exactly the same issues as using SS media for DS.
It's there; it's the same; but it has not been tested for that use.
This is assuming all 720k 5 1/4" drives are interchangeable. There are relatively
few of those out there, but being there are any number of 360k drives that are not
interchangeable, I have my doubts. It may be that controllers are finicky but that's
the whole point really.
I'm going to guess a 720k or 1.44meg drive
won't work but it's not
impossible.
720K BETTER work.
720K 3.5" was developed EXPLICITLY to serve as a replacement for 720K
5.25" It is INTENDED to work. Although there is an assumption that you
are competent to set the drive select and other jumpers for installation. 
13 Feb
13 Feb
6:43 p.m.
On Wed, 13 Feb 2013, Chris Tofu wrote:
This is assuming all 720k 5 1/4" drives are
interchangeable. There are
relatively few of those out there, but being there are any number of
360k drives that are not interchangeable, I have my doubts. It may be
that controllers are finicky but that's the whole point really.
The interchangeability of 720K is SLIGHTLY better than that between 360K!
They each have a standard, and many deviations from that standard.
There are few, if any, 360K drives that can not be interchanged
by trivial CONFIGURATION work, such as drive select, jumpering
or cutting or adding a jumper wire to control such things as
ready/disk=change, head load (on motor on, drive select, always loaded, etc)
NOTE: we are NOT talking about SS V DS, 35track (SA400) V 40 Track
(everything that evolved FROM the SA400), 100 TPI, drives that are so
slow that they have forced Microsoft to modify DOS (Qume 142), or many
horrendously deliberately non-standard MODIFIED drives.
"Industry Standard" does NOT actually mean that you can drop
another drive in, sometimes you need to put in some dues and configure it.
Those are configuration/installation issues, and can and should
influence your choice of drive, but hardly qualify as "not interchangeable"!
The first time that I put an early Teac drive into a 5150,
I had to deal with the head-load solenoid.
Putting a DS drive (SA350) into a Gavilan required finding one on
which the [SA300] bezel would fit.
"That drive won't interchange"
"Don't be a wimp; just do it."
First time that I connected an 8" drive, it took a while. But, with
REASONABLE effort, it is "interchangeable"
First time that I put a "720K 5.25" drive into a 5150, I did not
KNOW that it was not a "360K" until I started examining tracks
to figure out why the disks that it formatted wouldn't work in a "360K".
OB_ AutoAnalogy:
VW air-cooled engines are "interchangeable". BUT, if I want to put
a 1969 engine into a 1958 bus, I need to replace the 12V generator
and coil with 6V ones, and replace the 130 tooth flywheel with a 109
tooth one. And if I want to use a 1969 SQUAREBACK engine in that 1958
(BTDT!), I have more stuff to attend to.
If you don't understand how to change and set Drive Select, or can
believe "it is not possible to change the drive select on that drive",
then never go with a different brand than you have, or hire expertise.
If you DO know, then all of the rest is just more of the same,
and can be a lot of fun learning.
In general, the easiest "720K" drives to configure are the ones that are
part of the same series as a "360K", such as Tandon TM100-4, SA455, 55F
Until you get your confidence, start with those.
--
Grumpy Ol' Fred cisin at xenosoft.com
4332
days inactive
4332
days old
1 comments
2 participants
participants (2)
-
cisin＠xenosoft.com -
rampaginggreenhulk＠yahoo.com