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1208.TXT
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1992-01-02
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Document 1208
FDISK CLUSTER SIZE
Description:
The cluster size that FDISK will select depends on the size of
the partition being created. The cluster size for a particular
partition size is shown in the following table:
Partition Size Bytes/Sector Sectors/Cluster Cluster Size
0 - 127.9MB 512 4 2K
128 - 255.9MB 512 8 4K
256 - 512MB 512 16 8K
The cluster size is adjusted for different partitions because of
the use of a 16 bit File Allocation Table (FAT). DR/PC/MS DOS
use a 16 bit FAT and can therefore keep track of 65,536
clusters. If each of these clusters is 2k, 2k x 65,536 is about
127.9MB. If a larger partition is desired, the cluster size has
to be increased since the number of clusters is limited. Thus
the cluster size goes to 4k. 4k x 65,536 is about 255.9MB. At
that point, the cluster size has to be adjusted again.
If a third party utility is used to create a partition using
different cluster sizes, the bytes per sector setting must be a
power of 2 (..,64,128,256,512,1024,..).
The above information is based upon using the FDISk utility
included in the February Business Update of DR DOS 5 or in
releases manufactured after that time. This includes DR DOS 6
and DR MULTI-USER DOS.
The following is for releases of DR DOS prior to 2/1/91
Partition Size Bytes/Sector Sectors/Cluster Cluster Size
0 - 63.9MB 512 4 2K
64 - 127.9MB 512 8 4K
128 - 512MB 512 16 8K