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9/96 How To: Optimizing Windows

FAT: Before and After

DiskEdit:

DescriptionAfter Creating New Partition Reformat, to Adjust Cluster Size and Reset Directory Entries
OEM ID:
Bytes per sector:
Sectors per cluster:
Reserved sectors at beginning:
FAT copies:
Root directory entries:
Total sectors on disk:
Sectors per FAT:
IBM 20.0
512
1
1
2
512
11270 (11270) **
44
IBM 20.0
512
64
1
2
512
11270 (11235) **
1
Volume label:
File system ID:
DRIVE-E
FAT16
PQ-MAGIC
FAT12

**(xxxxx) is DOS report

This abbreviated listing shows how Norton DiskEdit reports the boot record before and after tweaking a partition created with PartitionMagic. Note the changes in sectors per cluster, sectors per FAT and file system ID.

Chkdsk:

Before After
5,708,288
5,708,288
5,734,400
5,734,400
bytes total disk space*
bytes available on disk*
512
11,149
11,149
32,768
175
175
bytes in each allocation unit
total allocation units on disk
available allocation units on disk
*Neither figure reports the following space utilization:
512
18,432
18,432
16,384
53,760
5,708,288
5,762,048
512
512
512
16,384
17,920
5,734,400
5,752,320
bytes in boot record
bytes in FAT1
bytes in FAT2
bytes in directory
subtotal
Chkdsk report (above)
(same as Norton's DOS Report of sectors x 512)

Summary of a DOS Chkdsk report before and after adjusting the cluster size in a disk drive partition.

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