Twenty-two, ramdrive .sys use memory as a virtual disk

It should be noted that all data is present in memory and should be stored on the hard drive in a timely manner, otherwise it will lose power or crash

After all data will be lost, the advantage is that it runs fast but cannot be used in windows.

Example: config.sys: device=c:?dos?ramdrive.sys /size/e|a)

size is the number of bytes in k, i.e. the size of the established virtual disk.

/e or /a both use extended memory to build virtual disks, plus parameters on the premise that memory management must be loaded first

Himem .sys em386 .exe.