From: jkorman@alltel.net
On Tue, 08 Jul 2008 23:45:03 -0700, JT SoCal wrote:
>Jim wrote:
>> On Tue, 1 Jul 2008 20:56:56 -0500, "Gary" wrote:
>>
>>> are you using double sided drives?
>>>
>>>
>>> "glynf1" wrote in message
>>> news:4%xak.5708$oY2.3084@newsfe21.lga...
>>>> I have been refurbishing a Model 4. All works well with the exception of
>>>> double sided drives under TRSDOS 6.2.1 ( I can run Montezuma CP/M which
>>>> will format double sided disks) TRSDOS gives the option of double sided
>>>> when formatng, but the veryfy fails on all tracks - one sided will format
>>>> Ok What am I doing wrong?
>>>> Any help would be appreciated.
>>>> Thanks
>>>> Glyn
>>>>
>> What type of disks are you using. I had to bulk erase any of the high
>> density formatted disks I had purchased and then double density format
>> worked fine.
>>
>> Just a thought, Jim
>Actually you got lucky because the high density media uses a different
>material with different magnetic qualities not generally compatible with
>most double density drives. Mitsubishi was on of the few that could use
>the media back in the mid-80's. There was a drive manufacturer in the
>Valley North of Los Angeles, I don't remember their name at this time
>but I still have a few of their drives archived away for retirement days
>but it began with an M also. They and Mitsubishi were about the only
>ones that really got it right. I had occasion to test Shugart, Tandon,
>Siemens etc. and none of them really measured up to reliable business
>use as double sided 80 track double density drives.
>
>JamesSoCal
Probably so.....The first box or so of disks had problems. Finally
found a brand (??) that worked consistantly.
Jim
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