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`INTEL 1015
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`Computer Technology
`Encyclopedia: Quick
`Reference for Students
`and Professionals
`
`Michael Graves
`
`2% DELMAR
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`Library of Congress Control Number: 2008934855
`ISBN-13: 978-1-4283-2236-3
`ISBN-10: 1-4283-2236-1
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`Computer Technology Encyclopedia: Quick
`Reference for Students and Professionals
`
`Michael Graves
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`filesystem H 183
`
`A typical file systemis hierarchical, meaningit defines the location of data in
`layers. In a hierarchical system, a hard disk can be dividedinto partitions, which
`subsequently can be broken up into directories. Multiple subdirectories reside beneath
`the primary directories andfiles can reside beneath any directory or subdirectory. The
`file system keeps entries for every piece of data stored on the systemthat includes a
`lot of information about eachfile. Such information includes the location of data as
`described, but it also can include information suchas file attributes and permissions.
`Somefile systems allow data to be compressed and decompressed onthefly and
`some allow data to be encrypted and decrypted onthefly.
`File systems can be journaling or versioning in nature. A journaling file
`systemgets its name because it keeps a journalofall files. Before a change to any
`givenfile is written to the system, the journal entry for thatfile is updated with
`critical changes, suchasfile size, sector locations, and so forth. A versioningfile
`systemallowsa file to exist in multiple incarnations. When changesare made to
`the file and then saved, the original file is renamed andstored intact. This way
`if the user decides that the changes weren't for the better, she can go backto an
`earlier version. Most versioningfile systems allow the user to configure how many
`versions to keep before overwriting the oldest version. Table F'4 lists a numberof
`commonly seen file systems with a brief description of each.
`
`
`
`Microsoft
`
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`TABLE F.4
`File naming convention specifications
`
`
`
`
`FILE SYSTEM
`OS
`FILE NAME LENGTH
`
`Kira
`
`
`File allocation tables
`
`
`
`
`
`
`File allocation tables
`
`
`
`
`Masterfile table
`NTFS
`Microsoft
`
`
`
`
`
`
`256
`Metafile database
`HPFS
`IBMt
`
`
`255
`HFS
`Apple
`Unicode database
`
`Varies®
`Descriptor database
`ISO 9660
`Multi
`
`255
`Block mapping
`UDF Plain
`Universal
`
`
`
`
`
`UDF VAT
`Universal
`Block mapping
`
`
`
`
`Universal
`205
`UDF
`Block mapping with
`Spared
`sparing table
`
`
`“File name was limited to eleven characters, but a maximum of eight could be usedforthe file name, with three characters
`reservedfor the extension.
`t There were 255 characters included thefile extension, which can be any length.
`* Jointly developed between Microsoft and IBM, but IBM retained ownership after the partnership wasdissolved. Early Microsoft
`products included some support for HTFS.
`§1SO 9660 definesthree levels of file name. A Level1 file name emulates the MS-DOS 8.3 file name. A Level2 file nameloosely
`emulatesthe long file names supported by FAT32 and NTFS, but must include a 1-byte counter along withfile name byte
`counter. This typically limits ISO 9660files to 155 to 160 characters.
`5
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