FreeDOS help system (hhstndrd 1.0.8 en)[gcdrom]

Command: gcdrom.sys

GCDROM.SYS is a SATA native IDE CD/DVD-ROM driver for DOS (aka "ODD DOS driver"). GCDROM.SYS supports all SATA Native IDE controller, such as Intel ICH6/ICH7/ICH8, Jmicron 363/368, NVidia CK804/MCP55/MCP51 etc. GCDROM.SYS has to be loaded in CONFIG.SYS / FDCONFIG.SYS. When FreeDOS is already running, you can load GCDROM.SYS later with DEVLOAD. GCDROM.SYS is out of date. You should use UIDE.SYS instead.


device=gcdrom.sys [options] devicehigh=gcdrom.sys [options]


/AX Excludes ALL audio functions. This makes the driver report on a Device-Status request that it reads DATA tracks only! /AX reduces the resident driver by 448 bytes. UltraDMA, multi-drives, and other driver features are NOT affected! /Cx Determines number to detect 1st/2nd/3th SATA native IDE controller. Default = 0. /D: Specifies the desired "device name" which SHSUCDX or MSCDEX will use during their initialization to address the CD-ROM drives. Examples are: /D:CDROM1 /D:MYCDROM etc. The device name must be from 1 to 8 bytes valid for use in DOS filenames. If /D: is omitted, or the "device name" after a /D: is missing or invalid, "XCDROM" will be the default. /L Limits UltraDMA to "low memory" below 640K. /L is REQUIRED to use UMBPCI or a similar driver whose upper-memory areas cannot do UltraDMA. If /L is given, the driver must load in LOW memory so its DMA command-lists can fetch properly, or driver loading will ABORT! /L causes any I/O requests above 640K to use "PIO mode" input. Note that /L will be IGNORED if /UX is also given. /Mn Specifies the MAXIMUM UltraDMA "mode" to be set for a CD-ROM drive, where n is a number between 0 and 6, as follows: 0 = ATA-16, 16 MB/sec. 4 = ATA-66, 66 MB/sec. 1 = ATA-25, 25 MB/sec. 5 = ATA-100, 100 MB/sec. 2 = ATA-33, 33 MB/sec. 6 = ATA-133, 133 MB/sec. 3 = ATA-44, 44 MB/sec. A CD-ROM drive designed to use "modes" LESS than the given value will be limited to its own highest "mode". /M will be IGNORED for CD-ROM drives which cannot do UltraDMA, and it will be ignored for ALL drives if /UX is also given. /PM Requests the driver to check the IDE primary-master unit for a CD-ROM drive during driver init. If a CD-ROM drive is NOT found as primary-master, driver loading will ABORT! /PS Same as /PM but tests the primary-slave unit only. /SM Same as /PM but tests the secondary-master unit only. /SS Same as /PM but tests the secondary-slave unit only. --- NOTE --- Using multiple drives, multiple /PM /PS /SM /SS switches can be given. The first-specified drive is addressed as "unit 0", the second as "unit 1", etc. If fewer switches than drives are given, the unreferenced drives will NOT be used. If NO such switches are given, the driver "scans" for CD-ROM drives, from primary-master to secondary-slave. The first drive found will be "unit 0", the second will be "unit 1", etc. /UF Enables "Fast UltraDMA". Data input requests that cross an UltraDMA "64K boundary" are executed using a 2-element DMA command list, one for data up to the boundary, and one for data beyond it. CD-ROM speed is increased significantly. "PIO mode" input is still needed for user buffers that are misaligned (not at an even 4-byte address). /UF will be IGNORED for CD-ROM drives which cannot do UltraDMA. --- NOTE --- Despite any UltraDMA specs, NOT ALL chipsets or mainboards can run multi-element DMA commands properly! Although it is valuable, /UF must be TESTED on every system, and "Fast UltraDMA" should be enabled with CARE!! /UX Disables ALL UltraDMA, even for CD-ROM drives capable of it. The driver then uses "PIO mode" for all data input. /UX should be needed only for tests and diagnostic work. For each switch, a dash may replace the slash, and lower-case letters may be used.


GCDROM.SYS supports NLS (national language support), see "xcdmsgs.eng". It only has to be compiled in the corresponding language.


IN CONFIG.SYS / FDCONFIG.SYS: determine number to detect 1st/2nd/3th SATA native IDE controller: DEVICE=c:\fdos\bin\GCDROM.SYS /D:CDROM000 /C0 DEVICE=c:\fdos\bin\GCDROM.SYS /D:CDROM001 /C1 DEVICE=c:\fdos\bin\GCDROM.SYS /D:CDROM002 /C2 IN AUTOEXEC.BAT: c:\fdos\bin\SHSUCDX /D:CDROM000 /D:CDROM001 /D:CDROM002

See also:

(atapicdd.sys) autoexec.bat config.sys devload fdconfig.sys (mscdex) shsucdx (udvd.sys) uide.sys (xcdrom.sys) ------------------------------------------------------------------------------ Copyright (C) 2007 Jack Ellis, updated 2011 by W. Spiegl. This file is derived from the FreeDOS Spec Command HOWTO. See the file H2Cpying for copying conditions.