Tarbell is making me insane

[Allison]

>
>Subject: Re: Tarbell is making me insane
>   From: Grant Stockly <grant at stockly.com>
>   Date: Tue, 13 Nov 2007 11:34:53 -0900
>     To: "General Discussion: On-Topic Posts Only" <cctech at classiccmp.org>
>
>More to add...
>
>I know that writing to 3.5" HD disks with the hole covered to make 
>them look like DD is frowned upon, but maybe it could help determine 
>why I get errors with the real DD disks.
>
>While trying to back up my DD disks onto HD hole covered disks I got 
>an error.  Its not the disk because I've tried two and they both fail 
>at the same spot.

Bad write or media, or dirty head scaring disk.

>Also, are DD disks the same as Single Sided 3.5" 360/400k 
>disks?  Except for the double sided part?

I use a stack (about 200) of written once disks, they have sales
promo and utility on them and never distributed. Good media 
and easily erased.


>What are good sources for DD disks TODAY, not NOS disks, but new 
>disks?  Is athana the only place out there making DD disks?
>
>When copying from drive A to drive B it has an error at the end of 
>the disk.  Is this where a data rate issue would be the worst?

Inner tracks are always worst. 


>A>stat *.*                   |  B>stat *.*
>                              |
>RECS BYTS EX D:FILENAME.TYP  |  RECS BYTS EX D:FILENAME.TYP
>    0   0K  1 A:.INT          |    64   8K  1 B:ASM.COM
>   64   8K  1 A:ASM.COM       |    96  12K  1 B:BASIC.COM
>   96  12K  1 A:BASIC.COM     |     8   1K  1 B:COPY.COM
>    8   1K  1 A:COPY.COM      |    70   9K  1 B:CPM.COM
>   70   9K  1 A:CPM.COM       |    38   5K  1 B:DDT.COM
>   38   5K  1 A:DDT.COM       |    12   2K  1 B:DISKTEST.COM
>   12   2K  1 A:DISKTEST.COM  |    24   3K  1 B:DUMPDSK.COM
>   24   3K  1 A:DUMPDSK.COM   |    48   6K  1 B:ED.COM
>   48   6K  1 A:ED.COM        |     4   1K  1 B:FORMAT.COM
>    4   1K  1 A:FORMAT.COM    |    56   7K  1 B:PIP.COM
>   56   7K  1 A:PIP.COM       |     0   0K  1 B:RUN.$$$
>   92  12K  1 A:RUN.COM       |    24   3K  1 B:STAT.COM
>   24   3K  1 A:STAT.COM      |     8   1K  1 B:SYSGEN.COM
>    8   1K  1 A:SYSGEN.COM    |  BYTES REMAINING ON B: 11K
>BYTES REMAINING ON A: 0K     |
>                              |  B>
>A>                           |
>
>And the error:
>
>A>PIP B:=*.*
>
>COPYING -
>CPM.COM
>SYSGEN.COM
>DDT.COM
>COPY.COM
>PIP.COM
>ASM.COM
>STAT.COM
>ED.COM
>FORMAT.COM
>DISKTEST.COM
>DUMPDSK.COM
>BASIC.COM
>RUN.COM
>DISK WRITE ERROR: =*.*
>
>A: R/O, SPACE: 0K
>B: R/W, SPACE: 11K
>
>A>
>
>(can't be too save with my only good boot disk, A:.  :)

Disk write error... likely just not making it.


FYI: 3.5" disks were never meant to run at 125khz.  The 
720k mode is 250khz and the 1.44mh is 500khz.  The read 
amps just may not work well down that low.


Allison

>
>Grant