#4 cbmformat formats a disk in a way that it is unusable

v0.0.11
closed
cbmformat (4)
3
2012-09-14
2004-11-14
No

If cbmformat is used to format a disk, the disk is
unusable, has read/write errors, or shows other
unexpected (and unwanted) behaviour.

Andreas Boose found the reason: cbmformat is highly
picky on the RPM of the drive. If the drive runs at approx.
280 rpm (or lower) instead of the (nominal) 300 rpm, it
overwrites part of the track it has just written.

This bug will be fixed in the future.

Discussion

  • Spiro Trikaliotis

    Logged In: YES
    user_id=1059994

    Sorry, I mixed the numbers. The drive is not allowed to be
    more than 0.6% slower than 300 rpm, that is, it must spin at
    no less than 298 rpm.

     
  • Spiro Trikaliotis

    Logged In: YES
    user_id=1059994

    Sorry, I again mixed the numbers. The drive is not allowed to
    be 0.6% faster than 300 rpm, that is, it must not exceed
    301.8 rpm.

     
  • Spiro Trikaliotis

    Logged In: YES
    user_id=1059994

    This will be fixed in 0.1.0a and in 0.1.0.16. The solution is to
    use a probing formatter (instead of the non-probing one as
    now). This probing is done after writing, thus, it seldom
    requires more than one extra round per speed zone.

    -- Spiro.

     


Anonymous

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