last update on 12/11/2004 by Ashley
Hard disc stores
information in a fixed portion called blocks. A block is the least data portion
with its own unique address on a hard disc. In order to read or to record the
required data into the required place it is necessary to set a block's address
as a parameter of an operation given to a controller of a hard disc. A block's
size is standard for all hard discs for a long time of 512 bytes.
To specify a block address uniquely it is necessary to give all three parameters. This is widely adopted and called CHS
(cylinder, head, sector)
Other
than storage, hard disc can use to be a virtual memory when we fully utilize the
memory in RAM. However it is not as fast as the RAM. So, virtual memory can only
use as a spare memory of RAM.
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