APPLIED ENGINEERING RamKeeper - Manual (Page 53)

When the Cache Buffer becomes full, it will make room
for the most recently requested data by replacing the blocks
that have been stored in the buffer the longest without
being accessed. The Track Buffer is not variable; it is large
enough to hold one track (6K) and cannot be changed.
When you call for information, the system first looks in
the Cache Buffer. If the information is there, it reads it
with speed comparable to (often even faster than) reads
from RAM Disks and internal hard disks. If it doesn’t
find the information in the Cache Buffer, it checks the
Track Buffer. This takes very little more time than
reading from the Cache Buffer because the system is still
not required to read the disk drive.
If the information is not in the Track Buffer, the system
will then go back out to the disk drive, find the
information and read the entire track to the Track Buffer.
This new track replaces the track currently held in the
Track Buffer.
While this method actually goes through more steps than
a non-cached system to get information that is not stored
in the buffer, the actual time it takes the system to check
the Cache Buffer and Track Buffer is insignificant.
Copy Protected Programs
Some copy protected programs have a disk accessing
function of their own and cannot use the
Cache.
However, most programs will use the cache with no
problem.
44 RamKeeper