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The 640 Meg Shareware Studio CD-ROM Volume II (Data Express)(1993).ISO
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1992-09-09
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FYI
(Note: The origin of this information may be internal or external
to Novell. Novell makes every effort within its means to verify
this information. However, the information provided in this
document is FOR YOUR INFORMATION only. Novell makes no explicit or
implied claims to the validity of this information.)
TITLE: FDISK CLUSTER SIZES
DOCUMENT ID#: FYI-M-1208
DATE: 09SEPT92
PRODUCT: DR DOS
PRODUCT VERSION: 5.x 6.0
SUPERSEDES: FYI-M-1208 (01JAN92)
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 FAT SIZE Sectors/Cluster Cluster Size
0 - 7.9MB 12 bit 4 2K
8 - 15.9MB 12 8 4K
16 - 31.9MB 12 16 8K
32 - 127.9MB 16 4 2K
128 - 255.9MB 16 8 4K
256 - 511.9MB 16 16 8K
512MB - 999.9MB 16 32 16K
1GB - 2GB 16 64 32k
The cluster size is adjusted for different partitions because of
the use of a 12 or 16 bit File Allocation Table (FAT). DR/PC/MS DOS
use a 16 bit FAT on partitions greater than 32MB and can therefore
keep track of 65,518 clusters. A 12 bit FAT can only keep track of
4,077 clusters. The 12 bit FAT format is kept to maintain
compatibility with earlier versions of DOS.
A more detailed discussion of DOS partitioning methods can be found
in FYI-M-1207.