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Sat, 6 Feb 1999 22:22:18 -0600 |
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Len Warner wrote:
>
> >But be aware that a FAT16 drive saves files in 32K clusters,
> >which wastes a LOT of storage.
>
> It's primary partition size or (extended partition) logical drive size
> that matters, not the disk size. If you insist on having the FAT16 maximum 2GB
> all in one lump, you would be using _64K_ clusters, but you could create
> one or more sub-512MB partitions/logical drives with 16K clusters.
It's true that cluster size is based on partition size (and FAT type),
rather than drive size, but under FAT16 the largest cluster size is 64
KB only if you're using NT. For the rest of us, it's 32 KB. Then on the
lower end, sub-512 MB partitions are only 4 or 8 KB, rather than 16 KB.
The chart below lays it out pretty clearly, I hope.
DOS and Windows default FAT12/16 cluster sizes
Partition Size (MB) FAT Type Sects/Cluster Cluster Size
______________________________________________________________
0-15 12-bit 8 512 bytes
16-127 16-bit 4 2 KB
128-255 16-bit 8 4 KB
256-511 16-bit 16 8 KB
512-1,023 16-bit 32 16 KB
1,024-2,047 16-bit 64 32 KB
2,048-4,096 16-bit 128 64 KB (NT Only)
______________________________________________________________
Windows 95 OEM Service Release 2, Windows 98, and Windows NT 5.0
Default FAT32 cluster sizes
Partition Size (GB) Sects/Cluster Cluster Size
______________________________________________________
0.256-8.01 8 4 KB
8.02-16.02 16 8 KB
16.03-32.04 32 16 KB
> 32.04 64 32 KB
Jeff Delzer
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