"The maximum default cluster size under Windows XP is 4 kilobytes (KB) because
NTFS file compression is not possible on drives with a larger allocation size.
The Format utility never uses clusters that are larger than 4 KB unless you
specifically override that default either by using the /A: option for
command-line formatting or by specifying a larger cluster size in the Format
dialog box in Disk Management. "
-- http://support.microsoft.com/kb/314878
That also has the following table:
Drive size
(logical volume) FAT type Sectors Cluster size
-----------------------------------------------------------------------
15 MB or less 12-bit 8 4 KB
16 MB - 127 MB 16-bit 4 2 KB
128 MB - 255 MB 16-bit 8 4 KB
256 MB - 511 MB 16-bit 16 8 KB
512 MB - 1,023 MB 16-bit 32 16 KB
1,024 MB - 2,048 MB 16-bit 64 32 KB
2,048 MB - 4,096 MB 16-bit 128 64 KB
*4,096 MB - 8,192 MB 16-bit 256 128 KB Windows NT 4.0 only
*8,192 MB - 16384 MB 16-bit 512 256 KB Windows NT 4.0 only
Also see:
"As versions of Windows NT earlier than 3.51 do not support NTFS file
compression, the default cluster sizes will go above 4k."
-- http://support.microsoft.com/kb/140365
So it seems that FAT itself goes up to 256KB sector sizes -- but that usually
Windows prefers you to stay at 4KB or below.
vol_id should still probably support the larger sector sizes, especially
if disk makers are formatting with them against Microsoft's
recommendation.
--
vol_id: does not recognise FAT* partitions with sector size 8192
https://bugs.launchpad.net/bugs/147807
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