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By adding memory do you mean to add extra RAM disk(hardware) in the system?

well it seems that my disk is sda2
$df- h
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 225G 137G 78G 64% /
/dev/sda1 92M 9.4M 78M 11% /boot...

My output is
1.
/dev/hda:
using_dma = 1 (on)

2.
/dev/hda:

ATAPI CD-ROM, with removable media
Model Number: CD-ROM 52x.Max
Serial Number: 1999/04/28
...

No i haven't used mmap() the file. Should i use this?

Is there any specific hard disk type comes which is effective in read/write speed?

I have local disk. Which options u will recommend...

In my C program i am using very large file(approx 400MB) to read parts of it frequently. But due to large file the performance of the program goes down very badly. It shows very high I/O usage and...