tdsk

   device=tdsk.exe size [[s_sector [files [s_cluster]]]] [options]

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.

options

   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
   Makes tdsk use XMS memory

   /A
   /X
   Makes tdsk use EMS memory

   /C
   Makes tdsk use conventional memory (not ideal, so it is generally only
   recommended for systems without EMS/XMS or if you are having problems
   with EMS/XMS memory.)

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