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Examples of HFS Overhead
This section shows some figures regarding how much of a disc is used as "overhead" on
an HFS volume. (Overhead is the space on the disc required to store just the directory
format and not any data files.)
Disc Size
Approximate Overhead
single-sided 3
1
h-inch, and
44
%
(256-byte sectors)
5
1
/4-inch flexible discs
double-sided 3
1
h-inch flexible discs
22% (256-byte sectors)
18% (1024-byte sectors)
55 Megabyte hard disc
6%
130 Megabyte hard disc
6%
In addition, you should keep the disc less than 90% full for optimum performance.
These figures show only the "extremes" of the spectrum; however, they do show that:
• The overhead for larger hard discs is fairly constant at about 6% .
• Overhead for flexible discs may be large.
Mass Storage Concepts 3-15
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