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Ramdisk looks like a disk but locates in memory. You may require it if you want to get rid of disk access time of your program.

Find in [ref-1] the details of configuring a ramdisk and changing default size of a ramdisk.

Reference

[ref-1]
http://crazytoon.com/2007/06/01/ramdisk-how-do-you-install-and-set-up-ramdisk-under-linux-centos-rhel-fedora/