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Acronis PartitionExpert 2003 Manual

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Table 2. Linux file systems.
File system Ext2 Ext3 ReiserFS
Operating systems Linux Linux Linux
Max. partition size
16 TB 16 TB 16 TB
Max. file size Limited by parti-
tion size
Limited by parti-
tion size
Limited by parti-
tion size
Max. filename length
255 255 255
Restoration (logging) No Yes Yes
Max. files in root Unlimited Unlimited Unlimited
Max. clusters/blocks
~2
32
~2
32
~2
32
Cluster/block size
1–4 KB 1–4 KB 4 KB
File record table/I-node Set at formatting Set at formatting Dynamic
In case you for
g
ot computer en
g
ineerin
g
units: 1 Kbyte = 1024 Bytes, 1 Mbyte =
1024 Kbytes, 1 Gbyte = 1024 Mbytes, 1 Tbyte = 2
10
Gbytes= 1024 Gbytes, 1 Pbyte
= 2
10
Tbytes= 1024 Tbytes, 1 Ebyte = 2
10
Pbytes= 1024 Pbytes.
A.9.2 FAT16
FAT16 file system is widely used by DOS (DR-DOS, MS-DOS, PC-DOS, etc.),
Windows 95/98/ME, Windows NT/2000/XP operating systems and is sup-
ported by most other systems.
Main features of FAT16 are the file allocation table (FAT) and clusters. FAT is
the core of the file system. To increase data safety it is possible to have sev-
eral instances of FAT (there are usually 2 of them). A cluster is a minimum
data storage unit in FAT16 file system. One cluster contains a fixed number
(some power of 2) of sectors. FAT stores information about what clusters are
free, what clusters are bad, and also defines in what clusters files are stored.
Maximum size of a FAT16 file system is 4 Gigabytes, and the maximum num-
ber of clusters is 65525, the largest cluster being 128 sectors. Usually cluster
size is selected as minimum as possible so that the resulting number of clus-
ters is less than 65526. The larger the partition size, the larger the cluster
has to be. Most operating systems incorrectly perform with 128-sector clus-
ters, thus reducing the maximum FAT16 partition size to 2 Gigabytes.
Usually the larger the cluster size the more disk space is wasted.
Copyright © SWsoft, 2000–2002
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