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echo: os2prog
to: George White
from: Mike Ruskai
date: 1996-01-30 14:15:08
subject: Cluster algorithm

Some senseless babbling from George White to Mike Ruskai
on 27 Jan 96  22:21:02 about Cluster algorithm...

 MR>Rough cluster size is drive size divided by 65536
 MR>Convert rough cluster size to binary
 MR>Count number of digits in binary number (starting with first '1')
 MR>Actual cluster size is 2 raised to the power of the number of digits above
 
 MR>Is there anything wrong with this *other* than it not taking into account th
 MR>12-bit FAT of a <16MB drive?

 GW> Yes. The minimum cluster size on 16-bit FAT is 4 sectors (2048 bytes)
 GW> (another Microsoft odditity :-( ).

OK, then I did the correct thing (anything between 16MB and 64MB just gets 
2048 bytes, below 16MB is 4096 bytes, and everything else gets the formula 
applied).  A lot of people have responded that I should just check the boot 
sector, or call an API, but you're the only one so far that actually gave 
me the answer I was looking for :)  It's hard to check a boot sector in 
REXX, and impossible to check and API for a drive that isn't formatted FAT.

Mike [Team OS/2]
mruskai{at}microfone.net


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