10-10-2018, 08:35 PM
It's not quite so obvious to me. The tracks look good to me in the analyzer except for one invalid bit that occurs exactly 1/4th the way in to every track.
It took me a minute to figure out why this was, but I see that the media tester writes tracks that are longer than the actual track. Obviously to ensure there are no gaps on slower drives. At 300RPM it seems to overwrite about 1/16 of the first track, but on 360RPM (what I'm using) it overwrites about 1/4th. So I guess that part is normal.
Anyway, here is a dump of a media-tested disk.
http://s000.tinyupload.com/?file_id=7425...2791654897
I used a better quality (labeled 3M) disk just to be extra sure. Like the other disks it tests fine elsewhere.
I clicked "ignore" on each track so it would not re-write. It reported the following "bad" tracks and heads:
Track/Head
1 1
6 1
13 0
15 1
21 0
27 1
29 0
31 0
34 0
34 1
37 0
38 0
42 0
52 0
53 0
53 1
54 0
61 0
69 1
72 0
72 1
77 0
Viewing directly they look more or less normal to me.
But each time I test it will be completely random different tracks.
The 1.2mb drives in question are Teac FD-55GFR drives and the errors are reported at both 300RPM and 360RPM settings.
It took me a minute to figure out why this was, but I see that the media tester writes tracks that are longer than the actual track. Obviously to ensure there are no gaps on slower drives. At 300RPM it seems to overwrite about 1/16 of the first track, but on 360RPM (what I'm using) it overwrites about 1/4th. So I guess that part is normal.
Anyway, here is a dump of a media-tested disk.
http://s000.tinyupload.com/?file_id=7425...2791654897
I used a better quality (labeled 3M) disk just to be extra sure. Like the other disks it tests fine elsewhere.
I clicked "ignore" on each track so it would not re-write. It reported the following "bad" tracks and heads:
Track/Head
1 1
6 1
13 0
15 1
21 0
27 1
29 0
31 0
34 0
34 1
37 0
38 0
42 0
52 0
53 0
53 1
54 0
61 0
69 1
72 0
72 1
77 0
Viewing directly they look more or less normal to me.
But each time I test it will be completely random different tracks.
The 1.2mb drives in question are Teac FD-55GFR drives and the errors are reported at both 300RPM and 360RPM settings.