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Term
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Description
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Factory Reserved
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Drive jumper positions that are reserved for future options. It is wise the user not to place any jumpers across these pins.
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FAT
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File Allocation Table
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FAT 16
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One of the first versions of FAT (File Allocation Table) Technology. FAT 16 features:
1) Supports a Maximum of four volumes of 2 GB each = 8.4 GB Maximum sized Hard Drive.
2) Uses larger clusters (32 KB clusters for drives up to 2 GB in size), which can result in inefficient use for today's high capacity hard drives.
It can be upgraded to FAT 32, however. This newer format eliminates most of FAT 16 shortcomings.
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FAT 32
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A more recent version of FAT (File Allocation Table) Technology. FAT 32 features:
1) 2 terabytes Maximum sized Hard Drive (2,000 GB).
2) It does NOT work on Windows NT 4.0.
3) Uses space more efficiently. FAT 32 uses smaller clusters (e.g. 4 KB clusters for drives up to 8 GB in size), resulting in 10 to 15% more efficient use of disk space relative to large FAT drives.
4) Can NOT be changed back to FAT 16, due to an MS decision.
5) The more robust FAT 32 drives are less susceptible to a single point of failure than existing FAT volumes.
6) More flexible. Allows for dynamic resizing of FAT 32 partitions on hard drives.
7) More space: up to 28% more according to Microsoft over FAT 16.
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Feedback
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In a closed-loop system, the output signal (from the servo head) is used to modify the input signal (to the positioner).
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Fetch
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A read operation and its related data transfer operations.
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Flaw
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A defect.
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Flaw Map
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A defect map.
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Flux
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When a magnetic field is applied to a material, a magnetic flux is induced. The magnitude of this inductance is proportional to the magnetic permeability of the material.
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FM
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Frequency Modulation
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Format
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Preparing a hard drive for use with an Operating System AFTER it has been partitioned. In a disk drive, the arrangement of data on a storage media.
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Formatted Capacity
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The actual capacity available to store data in a mass storage device. The formatted capacity is the gross capacity, less the capacity taken up by the overhead data used in formatting the sectors and alocated as bad disk areas.
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Frequency Response
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A measure of how effectively a circuit or device transmits the different frequencies applied to it. In disk and tape drives this refers to the read/write channel. In disk drives, it can also refer to the dynamic mechanical characteristics of a positioning system.
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