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       floppymeter  -  measure raw capacity and exact rotation speed of floppy


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          floppymeter [-f] [-w warmup-delay] [-W window]
          [-c cycles] [-h] drive

       The floppymeter program measures characteristic parameters of a  floppy
       drive  and  floppy controller, such as the rotation speed of the drive,
       the data transfer  rate  of  the  controller,  and  the  resulting  raw
       capacity  of  a  disk  track.  To use this program, insert a disposable
       floppy in the drive, and  type  floppymeter  --density,  where  density
       describes  the density of the disk used for the test. (Should be one of
       dd, hd or ed). CAUTION: the data on the  disk  will  be  erased.   This
       program  should  be used to verify whether the drive and controller are
       out of tolerance if you experience problems  with  some  high  capacity
       formats.   It  only  needs to be run once per drive: although a disk is
       needed to perform the measurements, the measured data  only  depend  on
       the drive and the controller, and not on the disk.

       To  measure the raw capacity of the disk track, the floppymeter program
       formats the first track of the drive in a special way that allows it to
       read  the  raw  data  (gaps  and  headers)  of the disk. Thus, all data
       previously stored on that disk is lost.

       The rotation speed is measured by timing the return time  of  a  readid
       command.   In  order to gain more precision, the command is issued many
       times in a row. During this phase, the  number  of  rotations  til  the
       start  of  the test, the average time per rotation til the start, and a
       sliding average of the times of the last 30 rotations is  printed,  and
       updated continuously.

       The data transfer rate is deduced from the two parameters above.

       At  the  end  of the program, all parameters (raw capacity, duration of
       one rotation, and data transfer rate) are printed  again,  as  well  as
       their relative deviation to the standard value.  Finally, it suggests a
       capacity deviation description line, which can be directly pasted  into
       the drive definition file (See section Drive descriptions.).

       Usually,  the  data  transfer rate should not deviate more than 150 ppm
       from the expected value, and the rotation speed of the drive should not
       deviate  more  than  3000  ppm  from  the  expected  value.   If  these
       deviations are bigger, you may get problems with certain high  capacity

       If  the  raw  capacity  of  the  drive is too small, some high capacity
       formats may become unformattable on this drive/controller combo.

       If on the other hand, the raw capacity of the drive is too big, you may
       get  problems when writing to a disk formatted by this drive on another
       drive with a smaller raw capacity. In order  to  avoid  this,  increase
       superformats gap parameter (-G).

       -h     Prints a short help

       --dd   Tells the program that we use a Double Density disk.

       --hd   Tells the program that we use a High Density disk.

       --ed   Tells the program that we use an Extra Density disk.

       -f     Runs  the  measurement non interactively.  With this option, the
              program doesn’t ask for confirmation, and  doesn’t  display  the
              continuously   updated   values   during   the   rotation  speed

       -W Window
              This value  describes  how  many  rotations  are  used  for  the
              computation of the sliding average. Default is 30.

       -c cycles
              Describes  the  number of rotations clocked during the rotations
              speed determination test. Default is 1000.


       This program is quite new, and may have bugs. Here are a few  suggested
       tests to check its sanity:

       *      The  deviation  of  the data transfer rate solely depends on the
              controller. It  should  not  be  different  between  two  drives
              connected  to  the  same controller. However, the drive rotation
              speed may be different for different drives.

       *      All data transfer rates (for double, high and extra density) are
              derived  from a same master frequency. Thus the deviation of the
              data transfer rate should be independant of the density used.

See Also

       Fdutils’ texinfo doc