# Command: cdrcache.sys

      CDRCACHE.SYS is a CD drive cache program. It improves the drive
      performance. Requires XMS memory, and at least a 386 computer.
      CDRCACHE.SYS has to be loaded in CONFIG.SYS / FDCONFIG.SYS.
      When FreeDOS is already running, you can load CDRCACHE.SYS later
      with DEVLOAD.

## Syntax:

      In config.sys, either:
        device=cdrcache device name cachesize
      or:
        devicehigh=cdrcache device name cachesize

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## Options:

      device     The same name of the device that you previously loaded
                 with your CD-ROM device driver.
      name       A new name which you will pass to shsucdx in the autoexec.bat
      cachesize  Specifies the cache buffer size in kilobytes. The cache is
                 stored in XMS memory.
                 Minimum value is 128
                 Maximum value is 65280
                 Values below 100 are valid for compatibility with previous
                 versions of CDRcache. Below 100, sizes are interpreted as
                 multiples of 0.25MB.
      Controlling the driver after loading:
        Use:
      echo command > name
      Command:
        F     Flush the cache
        S     Show Statistics
        I     Show statistics with extra technical Information
        C     Clear statistics
        Q     Quiet mode
        N     Normal verbosity
        V     Verbose/trace mode
        0     Stop caching
        1     Continue caching (after stop for instance)
        ?     Shows the help
        name  is the parameter passed to CDRcache (see example).

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## Comments:

      Load CDRCACHE after loading your CD-ROM device driver (usually
      xcdrom.sys).
      As CDRCACHE (2003) is based on LBACACHE, please read the LBAcache
      documentation for some additional technical/programming details.

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## Examples:

      In config.sys / fdconfig.sys:
        DEVICE=c:\fdos\bin\xcdrom.sys /D:FDCD0000
        DEVICE=c:\fdos\bin\CDRcache.sys FDCD0000 CDRCACH$ 2048
      then in autoexec.bat:
        c:\fdos\bin\shsucdx /D:CDRCACH$
      This allocates a 2048KB (2MB) cache buffer for a single IDE CD drive.
        echo F > cdrcach$    (flush cache)
        echo SCF > cdrcach$  (show statistics, then clear statistics and
                             flush cache)
        echo S > cdrcach$    (only show statistics)

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## See also:

      atapicdd.sys
      devload
      lbacache
      mscdex
      shsucdx
      tickle
      udvd.sys
      xcdrom.sys

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## File:

      Please read this command's lsm file also.
      You will find the updated version (internet) here and
      the version described in this manual page here.
      The lsm file contains information about the name of the programmer,
      the download site, and some other command related information.

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      Copyright © 2004 Robert Platt, updated 2008 by W. Spiegl.

      This file is derived from the FreeDOS Spec Command HOWTO.
      See the file H2Cpying for copying conditions.