Using a RAM Drive to Enhance Performance of DISKCOPY (107135)
The information in this article applies to:
• Microsoft MS-DOS operating system 6.2
• Microsoft MS-DOS operating system 6.21
• Microsoft MS-DOS operating system 6.22
This article was previously published under Q107135
In MS-DOS 6.2 and later, the DISKCOPY command uses your hard disk drive to
temporarily store the data copied from the source disk. This enables single-
pass disk copies. If you install a RAM drive, you can increase the
performance of this operation.
DISKCOPY uses the location defined by the SET TEMP statement to
determine where the data from the source disk should be temporarily
stored before it is written to the destination disk.
If you install a RAM drive and define it as your temporary (TEMP)
directory, you can redirect the data accessed from the source disk
into RAM, thus eliminating the time required for the system to perform
read and write operations to the hard disk drive.
To do this:
• Set up a RAM drive in your CONFIG.SYS file using the following
NOTE: Make sure the RAM drive is large enough to hold all data from
the largest floppy disk drive on your system. (The size given here
sets up a 1.44-megabyte RAM drive.
device=c:\dos\ramdrive.sys 1480 /e
• In your AUTOEXEC.BAT file, change the SET TEMP line to point to the
RAM drive as follows
where <x> is the drive letter assigned by the system to the new RAM
The performance gain is not significant on high performance systems
with fast processors and hard disk drives; however, it does increase
the overall speed of this process on older systems.
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