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All magnetic storage devices, such as floppy
disk drives and hard disk drives, read and write data by using
electromagnetism |
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This is produced by a magnetic field that is
generated around the conductor |
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Are techniques for encoding data for magnetic
storage |
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Examples are: |
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FM - Frequency Modulation |
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MFM - Modified Frequency Modulation |
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RLL - Run Length Limited |
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Sometimes called Single Density encoding |
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Used in the earliest floppy disk drives
installed in PC systems (found in the early Osborne computers) |
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No longer used |
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Minimizes the use of clock transitions, leaving
more room for the data |
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Because it is twice as efficient as FM encoding,
MFM encoding also has been called Double Density recording |
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Up to 50% more information on a given disk than
MFM |
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Instead of encoding a single bit, RLL normally
encodes a group of data bits at a time |
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Configure the drive |
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Configure the host adapter |
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Physically install the drive |
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Configure the system |
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Partition the drive |
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High-level format the drive |
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Install the OS if a boot drive |
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Sockets for Ribbon Cable 1 and 2 on Motherboard |
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Designate the drive as a master or a slave |
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Set SCSI ID if necessary |
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Terminate if necessary |
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SCSI drives usually require a host adapter card
that you must install in a bus slot like any other card |
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IDE drives usually have the I/O interface
integrated into the system’s motherboard |
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Some computer cases require plastic rails for
the drive to slide into place |
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Note the length of the drive cable |
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Make sure you use only the screws that come with
your new drive |
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IDE drives are configured in the system BIOS.
Autodetect if possible |
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May need to enter Heads, Cylinders, and Sectors
manually |
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SCSI drives normally follow a custom setup
procedure that varies depending on the host adapter that you are using |
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DOS FDISK command |
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NT Disk Administrator |
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Both of above are destructive partitions
(deletes all data) |
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Partition Magic is a non-destructive
partitioning software |
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Low Level not necessary for IDE |
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Low Level may be necessary for SCSI |
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High level necessary for both |
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DOS Format command |
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Types of drives include |
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1.44 Mb 3.5 inch drive |
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2.88Mb 3.5 Inch Drive |
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720Kb 3.5 Inch Drive |
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1.2Mb 5.25 Inch Drive |
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360Kb 5.25 Inch Drive |
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Typically not needed very often |
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Simple head-cleaning kits available from
computer- or office-supply stores |
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Use a cleaning swab with a liquid such as pure
alcohol or trichloroethane |
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Notes