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Losing memory



I did the following on a recently rebooted machine. Observe the "free" 
column of the "-/+ buffers/cache" line. It looks like running "hdparm -t" 
permanently lost me about 7MB of RAM (114840 vs 107668). Could someone 
tell me why this is happening, or how I am misreading "free" here? 
Nothing fancy here, just a generic KT133 machine with a single IDE drive.
Thanks.

Chris


# free
             total       used       free     shared    buffers     cached
Mem:        126700      50428      76272          0       1808      36760
-/+ buffers/cache:      11860     114840
Swap:       265032          0     265032
# hdparm -t /dev/hda
 
/dev/hda:
 Timing buffered disk reads:  64 MB in  2.80 seconds = 22.86 MB/sec
# free
             total       used       free     shared    buffers     cached
Mem:        126700     123136       3564          0      67344      36760
-/+ buffers/cache:      19032     107668
Swap:       265032          0     265032





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