I-Bus IBC 2600, Руководство пользователя

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Chapter 3 - Standard CMOS Setup
3-5
IBC 2600 User’s Guide
NOTE: The auto detect feature displays disk parameter values as estab-
lished by the drive manufacturer. If the drive has been formatted using
any other values, accepting the auto detect values will cause erratic be-
havior. You must either reformat the drive to meet the manufacturer’s
specifications or use the User type to enter parameters which match the
current format of the drive.
User-Defined Drive Types
If the parameters supplied by the manufacturer of your disk drive do not
match any of the preprogrammed drive types provided by AMIBIOS, you
may enter the parameters manually.
The user-defined parameters for each of the four drives may be different,
which effectively allows four different user-definable hard disk types.
Scroll to the end of the drive type list to the User type. You can manually
enter the Cyln, Head, WPcom and Sec parameters. The Size parameter
is automatically calculated and displayed by the system based on the
other parameters entered.
Use the arrow keys or tab key to move between fields. Once you have
placed the cursor in a field, type in the correct value.
The following explains the drive parameters which you must enter for a
drive type which is not in the list:
Type is the numeric designation for a drive with certain identifi-
cation parameters.
Cylinders (Cyln) is the number of disk cylinders found in the
specified drive type.
Heads (Head) is the number of disk heads found in the specified
drive type.
Write Precompensation (WPcom) is the read delay circuitry
which takes into account the timing differences between the in-
ner and outer edges of the surface of the disk The size of the
sector gets progressively smaller as the track diameter diminish-
es. Yet each sector must still hold 512 bytes. Write precom-
pensation circuitry on the hard disk compensates for the physical
difference in sector size by boosting the write current for sectors
on inner tracks. This parameter designates the track (cylinder)
number where write precompensation begins.