Re: 370A floppy drive?


Craig
 

Dennis,

Never found this to be a problem, because after placing the tape over the hole, the disk is formatted in the 370 drive at the larger tracksize.

First step is always format in the 370. After the 720K format there are no narrow tracks.

Craig


, 9/8/14, 'Dennis Tillman' @Dennis_Tillman_W7pF [TekScopes] <TekScopes@...> wrote:I

Subject: RE: [TekScopes] Re: 370A floppy drive?
To: TekScopes@...
Date: Monday, September 8, 2014, 5:12 PM


 









A few things you might want to consider before
using 1.44MB high density

floppies in a low density drive:



The higher density requires more tracks. More tracks
requires that each

track be thinner. When you make the track thinner you have
to increase the

amount of magnetic force to change the orientation of a
domain bit of the

ferrite material coating the disk. So 1.44 MB floppies use
stronger fields

in their write heads, and have greater positioning precision
to track the

narrower tracks.



Problem arise when you mix HD floppies and LD floppies. The
heads of LD

floppy drives are not strong enough to RELIABLY write data
to an HD floppy.

When a HD formatted floppy is put into a LD drive the LD
drive does not have

the precision necessary to follow the narrower track to read
data RELIABLY.



The end result of these differences is that you may have
problems with the

reliability of the data. It might be there one day and not
be readable the

next day. Or one brand of floppies might work better than
another. The

question you have to ask is can you trust your data will be
retrievable when

you need it?



Dennis Tillman W7PF

-----Original Message-----

From: TekScopes@...
[mailto:TekScopes@...]

Sent: Monday, September 08, 2014 8:05 AM

To: TekScopes@...

Subject: Re: [TekScopes] Re: 370A floppy drive?



Used one of these on a daily basis for many years. It will
only work with a

low density floppy.



You can use the 1.44 high density floppy but you have to put
a piece of

opaque tape over the hole to make the 370 think it is low
density.



As I rmember, the floppy has to be formatted in the 370 for
it to be

recognized.



Craig

--------------------------------------------



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Posted by: P Baker <craigyard99@...>

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