Logical Formats

Logical formats that are used for common drives

Any media consists of a physical format  (700MB CD-ROM) and also a logical format eg UDF 1.5.  The list below describes the possible logical formats that CnW Software will process

ISO9660, Joliet.  These are formats that are found on CDs and DVDs.  The only signifcanty difference between the two is that Joliet allows for longer file names.  Both can be multi-session, which means that new tracks may be appended to an existing CD

UDF - several variations from V1.5 to V2.5.  It is typically used on CDs and DVDs, in particular in RW form.  It is also used on Iomega Rev Drives. In theory it can be used on any media, and so is also used on certain Optical disks  -ie 5.25 disks, rather than CDs or DVDs

FAT12, FAT16, FAT32.  This is the basis of most PCs before NT, Windows 2000, XP etc. The limitation of FAT32 is that no file may be larger than 4GB, though the disk drive could be 2TB in size.

NTFS.  This is a high performance PC based disk format Files have no effective size limitation. The main variation within NTFS is the ability to have optional automatic compression of files as they are written to a disk, and expansion when reading.  Once set, it is totally invisible to the user. The compression can be set for a drive, a subdirectory, or just a file. Files may also be encrypted with NTFS

HFS and HFS+  This is the structure used by most Macintosh computers

exFat - A Microsoft replacement for FAT32

Linux. The Linux file system is based on Unix and can be used on many types of computer, though typically PCs.  This is under development for CnW Recovery

Unix - ext2/3  being developed

HPOFS CnW Recovery will read some versions of HPOFS

 

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