From: JT@9b01.com   
      
   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   
      
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