IBM Deskstar 25GP Installation And Reference Manual page 64

10. When I create partitions using IBM DriveGuide Easy Installation Software, my
partitions are smaller than the size I entered.
Partitions begin and end on cylinder boundaries, IBM DriveGuide must allocate partitions
that may be a few megabytes smaller than the size you entered. IBM DriveGuide adds
these megabytes to free space for later partitions.
11. I copied files from my old drive to my new IBM Deskstar. Why do the files take
up more space on the new drive?
Partitions are divided into units called clusters. The size of a cluster is based on the size
of a partition. Because partitions on large capacity drives are bigger, the cluster sizes are
bigger. The files take up more space because the partitions they're stored in are larger.
12. Why is the capacity of my IBM Deskstar less than the capacity listed on the
drive label?
Some programs measure the capacity of a hard disk drive based on a kilobyte of 1,024
and a megabyte of 1,048,576 (1,024 x 1,024). Drive manufacturers state the capacity of
a hard disk drive based on the decimal numbering system. For example:
10,000,000,000 bytes ÷ 1,024 = 9,765,625 kilobytes
9,765,625 kilobytes ÷ 1,024 = 9,536.74 megabytes
9,536.74 megabytes ÷ 1,024 = 9.31 gigabytes.
13. Why doesn't my operating system show the full capacity of my drive?
Few systems built before 1997 support drive capacities greater than 8.4 GB, because the
CHS (Cylinders, Heads, Sectors) method of translation uses ID words 1, 3, and 6 of the
Identify Drive Command. The maximum values for words 1, 3, and 6 are 16,383
cylinders, 16 heads and 63 sectors for a capacity of 8.4 GB. A new extended interrupt 13
function was defined to get beyond this boundary. By mid-1998, most new systems had
introduced this support. Problems with systems which do not support greater than
8.4 GB can be solved with one of the following options:
• Obtain a BIOS upgrade from your system vendor that includes Extended Interrupt 13
support.
• Use IBM DriveGuide to install your IBM Deskstar.
• Purchase an IDE controller card with an onboard BIOS that supports Extended
Interrupt 13.
14. What capacity limitations should I be aware of when installing my operating
system?
DOS 6.22 and earlier versions, Windows 3.1, Windows for Workgroups are limited to
8.4 GB and do not support disk capacity beyond 8.4 GB.
Windows 95A supports Extended Interrupt 13. Windows 95 can see drives greater than
8.4 GB, but uses the FAT16 file system. The drive needs to be partitioned into 2047 MB
partitions.
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