FreeDOS help system (hhstndrd 1.0.8 en)[tdsk]

Command: tdsk

TDSK creates a RAM disk. Part of memory is set aside to act like a disk drive. Because memory is much faster than a real disk drive, RAM disks are very fast, but anything stored on them will be lost when the machine is restarted or switched off. TDSK supports XMS, EMS and conventional memory.


device=tdsk.exe size [[s_sector [files [s_cluster]]]] [/E] [/A|X] [/C] [/M]


size the size of the RAM disk, from 8 to 65534 (in Kilobytes). [[s_sector [files [s_cluster]]]] Advanced. The size of the sectors, root and clusters on the disk. Valid values for sector are 32,64,128,256,512,1024,2048. Files (in the root direcotry) can be from 1 to 65534. Clusters can vary from 1 to 255 (some systems are restricted to 1,2,4,8,16,32,64,128) /E Forces the use of XMS memory. /A Specifies the use of EMS memory. /X Specifies the use of EMS memory. /C Forces use of conventional memory (not ideal, so it is generally only recommended for systems without XMS/EMS or if you are having problems with XMS/EMS memory.) /I:nnn nnn=country code. This will show the help in another language. /M Switches the screen output from color to monochrome(redirect- able) while in CONFIG.SYS monochrome will be used by default. /B avoids to load TURBODSK if there is at least one hard disk available on the system. /F selects the number of FAT copies (1 by default) up to a maxi- mum of 2. /H Shows the help. /? Shows the help.


Size must be in the range 8 - 65534 KB; valid sectors are from 32 to 2048 Bytes (in powers f 2), though some DOS versions support 128, 256 and 512 Bytes only. Files of root may be 1 to 65534 and sectors by cluster can vary from 1 to 255 (some systems need a power of 2). Only the size is necessary. Turbodsk defaults to XMS or EMS. After installing TURBODSK in CONFIG.SYS it can be run from AUTOEXEC.BAT or the prompt in order to vary the drive size (amount of memory used); this also erases the drive's contents. A size 0 can be used to completely free the memory occupied by the drive: When using conventional memory it is useful to cancel a drive BEFORE resizing. When more than one TURBODSK is installed, they can be identified by additionally giving the drive letter. By default, tdsk tries to use XMS or EMS, before trying to use conventional memory. Most modern computers have XMS. Why use a RAM disk? Many programs create temporary files, which will be stored in a temporary directory specified by an environment variable: set temp=c:\temp Temporary files are deleted when a program exits anyway. So one of the main uses of RAM disks is to hold this temporary directory. This increases such programs' performance. TDSK has the following EXITCODES (ERRORLEVEL): 0: Disk not defined 255: Driver not installed from CONFIG.SYS 254: Incorrect drive letter specified 253: Attempt to define a drive from within a multitasking environment such Windows, DOSSHELL, TASKMAX/TASKMGR, etc. 252: Syntax error Other values below 128 are related to the handle used in both the Extended or the Expanded memory.


IN CONFIG.SYS/FDCONFIG.SYS: device(high)=c:\fdos\bin\tdsk.exe 8096 (creates 8096 KB RAM disk) tdsk.exe 0 resizes the ramdisk to 0 Byte size (deletes all files) tdsk.exe 2048 resizes the ramdisk to 2048 KB size (deletes all files)

See also:

autoexec.bat config.sys (emm386 (EMS)) fdconfig.sys (fdxms (XMS)) (fdxms286 (XMS)) (himem (XMS)) himemx (XMS) jemm386 (EMS) jemmex (EMS) rdisk ------------------------------------------------------------------------------ Copyright (C) 2003 Robert Platt, updated 2011 by W. Spiegl. This file is derived from the FreeDOS Spec Command HOWTO. See the file H2Cpying for copying conditions.