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Installation and Configuration
User-Definable Drive Types
If the correct AT disk type is not listed, the EPC provides user-editable drive types 48
and 49. Select either of these drive types. Use the TAB key (
← →
cursor keys (
) to move to the next (or previous) field. Note that the default
settings for MBytes, Cylinders, Heads, and Sectors is 1. MBytes is a display-only
field calculated by the BIOS. Move the cursor to each field (Cyls, Heads, and
Sectors) and type the value for that field. The information is listed on a non-
removable sticker attached to the hard drive. The BIOS allows use of the following
maximum values:
Cylinders 1023
Heads 63
The hard disk you are using may have parameters larger than the allowable
maximum. If the number of cylinders for your drive is greater than the maximum
allowable number, you may have to use 1023 cylinders which will limit the usable
size of the drive. However, most IDE drives support universal translation mode. If
the drive you are using supports this mode and the actual parameters are greater than
the allowable maximum, divide the actual number of cylinders by 2 and multiply the
actual number of heads by 2.
That is, each sector is addressed as an absolute
sequential sector number. Since the drive converts the sector data to an absolute
number, these "false" cylinder and head numbers will still allow the full capacity of
the drive to be used. The following example shows how this is done.
Actual
parameters
Cylinders
1350
Heads
5
Sectors
32
Total
Sectors
216,000
Table 2. Fixed Disk Conversion Values.
After the fixed disk(s) have been configured, press F10 to save the data or ESC to
ignore the changes. In either case you return to the main setup screen. Follow the
instructions on the screen to save and exit or ignore changes and exit.
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→|
)or the left and right
Sectors 16
Conversion
Numbers
factor
to Use
divide by 2
675
multiply by
10
2
(none)
32
216,000
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