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       zcav [-b block-size] [-c count] [-u uid-to-use:gid-to-use]
       [-g gid-to-use] [-f] file-name


       This manual page documents briefly the zcav, program.

       Modern hard drives have a constant  rotational  speed  but
       have  varying numbers of sectors per track (outside tracks
       are longer and have more sectors). This is referred to  as
       Zoned  Constant  Angular  Velocity  (or  ZCAV).  The outer
       tracks will have a higher data transfer rate due to having
       more  sectors  per  track, these tracks generally have the
       lower track/sector numbers.

       This program tests the ZCAV performance of a  hard  drive,
       by  reading  the  entire  data on it a specified number of
       times. The file name given as the first parameter, it  can
       be  specified  as -, for standard input. This file will be
       opened as read-only and in  usual  operation  it  will  be
       /dev/hdX  or /dev/ide/host0/busX/targetY/lun0/disc depend­
       ing on whether you use devfs or not (NB operating  systems
       other than Linux will have different device names).

       The  output  should be able to be easily graphed with gnu­
       plot which is what I use to view the results.


       -b     the size of the blocks to read from  disk  (default

       -c     the number of times to read the entire disk.

       -f     the file-name for the input data. This isn't needed
              on well configured systems that have a recent Glibc
              where  you can specify the file name without the -f

       -u     user-id to use.  When running as root  specify  the
              UID  to  run the tests as, it is not recommended to
              use root, so if you want to  run  as  root  use  -u
              root.  Also if you want to specify the group to run
              as then use the user:group format.  If you  specify
              a  user by name but no group then the primary group
              of that user will be chosen.  If you specify a user
              by  number  and  no  group  then  the group will be




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