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echo: os2prog
to: Mike Ruskai
from: Jerry Lapham
date: 1996-02-14 22:28:00
subject: Cluster algorithm

Mike Ruskai said to Coridon Henshaw in the Fido OS2 Programming
conference on 01-30-1996:

MR> Does anyone know what the cluster size for a FAT volume would be between 16MB
MR> and 64MB?

From Ted Schulze in the RIME IBM conference:

        Partition Size    FAT Type   Per Cluster     Size 
       ----------------   --------   -----------   ------- 
        0 MB -  15 MB      12-bit         8           4K 
       16 MB -  127 MB     16-bit         4           2K 
      128 MB -  255 MB     16-bit         8           4K 
      256 MB -  511 MB     16-bit        16           8K 
      512 MB - 1023 MB     16-bit        32          16K 
     1024 MB - 2048 MB     16-bit        64          32K 
 
(1) Sectors are 512 bytes in size.
(2) This applies to MS-DOS versions 3.2, 3.21 3.3, 3.3a, 4.0, 
    4.01, 4.01a, 5.0, and 5.0a. 
(3) The 4K cluster size for the 0-15MB size is for compatibility with
    the 4K cluster size used on PC/XT 10MB drive and DOS 2.x

    -Jerry

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