plz i want to know which is the fast: network communication or harddisk ??

Depends on the network and hardware.

Your question is similar to asking which is faster: wind or rain?

i want know which is faster in the general case ..

Well, Your question is too general:
What type of network connection are you talking about? For example, is it LAN with 100 Mbps or 1Gbps?
Concerning the Hard Disk, is it an IDE or SCSI or SSD disk, since each one support a certain speed.

i want know which is faster in the general case ..

In general, which is faster: wind or rain?

Wind;)

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