Can you do hard drive caching? How?

[Mark Phillips <mark@ist.flinders.edu.au>]

Hi,

I run latex a lot and every time I run it, it has to load in library files
from disk, which takes time.  I could try to buy a fast but expensive SCSI
drive, but I thought probably a cheaper way would be to buy more memory
and somehow use it to cache my existing hard drives -- ie stuff which is
commonly read from the disk would be stored in memory.

Is there software in linux which will do this?

Cheers,

Mark.
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