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Posted on 2002-03-22
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In FAT32 format , is the sector address pattern as per A or B.

Pattern A is arranged in sequence
Pattern B is arranged in skew / oblique

< Pattern A >

Cluster #      C/H/S     C/H/S
Start     End
============================
1          1/1/1   to     1/1/8      = 8 sectors x 512 = 4096 bytes
2          1/1/9   to     1/1/17     = 8 sectors x 512 = 4096 bytes
3          1/1/18 to     1/1/26     = 8 sectors x 512 = 4096 bytes
4          1/1/27 to 1/1/35     = 8 sectors x 512 = 4096 bytes
5          1/1/36 to 1/1/44     = 8 sectors x 512 = 4096 bytes
6          1/1/45 to 1/1/54     = 8 sectors x 512 = 4096 bytes
7          1/1/55 to 1/1/63     = 8 sectors x 512 = 4096 bytes
8          2/1/1   to 2/1/8
9          2/1/9   to 2/1/17
10          2/1/18 to 2/1/26
...etc

< Pattern B >

Cluster #      C/H/S     C/H/S
Start     End
============================
1          1/1/1   to     1/1/8      = 8 sectors x 512 = 4096 bytes
2          2/1/9   to     2/1/17     = 8 sectors x 512 = 4096 bytes
3          3/1/18 to     3/1/26     = 8 sectors x 512 = 4096 bytes
4          4/1/27 to 4/1/35     = 8 sectors x 512 = 4096 bytes
5          5/1/36 to 5/1/44     = 8 sectors x 512 = 4096 bytes
6          6/1/45 to 6/1/54     = 8 sectors x 512 = 4096 bytes
7          7/1/55 to 7/1/63     = 8 sectors x 512 = 4096 bytes
8          1/1/9   to 1/1/17
9          2/1/18 to 2/1/26
10          3/1/27 to 3/1/35
...etc

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Question by:hhheng
• 2

Author Comment

ID: 6891769
Without further elaborating , I think the above-question offer some confusions.
My intention is to know how a sector address is recorded. After a low-level format, sector and tracks are built-up then format by OS. When formating , how are  the sector / address numbered,  this is the question I am interested. If contigously, does it means that say, first sector address is "1/1/1" in "C/H/S format" and the next sector address is "1/1/2" and  so forth OR skewingly , first sector address is "1/1/1" followed by "2/1/2" and so forth.
Those who have a  disk utility that can read a sector at byte level will be able to view the address sector by sector.
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Accepted Solution

vipat earned 200 total points
ID: 6892870
In those days FAT16 still typically being used, to minimized the disk accessing time, the DOS disk sectors are (logically) formed in the pattern "A". But, since disk size is growed more than 8GB limit, the LBA disk-accessing method is now used instead of CHS method. (For example, FAT32X partition no longer uses CHS values in partition table anymore.)

To prove this, simply boot your system into command-prompt only mode, and run disk-editor software (which also support LBA disk accessing method). If you don't have any startup disk yet, get one at www.bootdisk.com first. ;)
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Author Comment

ID: 6893005
Thanks and cheers
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