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It is hardware. However, it is possible to create in software a "virtual" hard disk and this would be software.
It allows hard disk space to be used as RAM It acts as an overflow buffer for the physically available
No. Disk caching improves hard-disk performance by anticipating data needs.
The size the virtual memory is determined by the size of the page file which saved in your hard disk. Virtual memory only uses the hard disk.
Only on a virtual machine.
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It is hardware unless it is a virtual disk in which case it is software implemented on hardware.
your disk drive.
Do the Defregment disk
CPU usgae, disk I/O, network performance, etc., are part of server performance.
Virtual Hard Disk (VHD)Those type of file are using mostly for computer emulatorsThey are the same as ZIP,RAR,ZIPX...Strong coded that only can be read from programs like Virtual PC,and of coure strong compressed.
msconfig, Disk Cleanup, Disk Defragmenter, Disk Check, Power Options and "Adjust appearance and performance of Windows".