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What Is a File Sequence?

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  • Written By: Eugene P.
  • Edited By: A. Joseph
  • Last Modified Date: 25 August 2016
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A file sequence is a series of related computer files that contain some data indicating their inclusion in a common set.‭ ‬The data that marks a file as part of a‭ ‬file sequence can be stored in the name of the file or can be contained in a data field inside of the file.‭ ‬The physical location of the file can also be used to‭ ‬signify the presence of a sequence.‭ ‬The‭ ‬sequence can be used to help organize files on a system visually,‭ ‬or it can be used to facilitate input into a program designed to process the series of files.‭ ‬Some software programs are able to treat a file sequence as a single object to allow random access to areas buried deep within the object ‬without‭ ‬the need to open a single large file.

A sequence of files can be indicated by adding an ascending series of numbers or letters to the file‭’‬s name ‬before the‭ ‬final‭ ‬extension‭ ‬separator.‭ ‬Most operating systems will organize these files by name when displayed,‭ ‬although there are certain technical aspects that can cause a list to appear out of order.‭ ‬Specifically,‭ ‬file names are listed in strict alphanumeric‭ ‬order on most operating systems, with no translation of numbers into actual integers.‭ ‬This means that numbers with fewer digits than their greater counterparts,‭ ‬such as 1 and 10,‭ ‬need to have 0s padded before the‭ ‬lower‭ ‬number to match the number of digits for correct sequencing.

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In some instances,‭ ‬it can be‭ ‬advantageous to have not only the names of files be in sequence ‬but also to have the actual data physically recorded in a long‭, ‬unbroken‭ ‬chain on the media.‭ ‬This can‭ ‬have the benefit of very fast file access as well as enabling‭ ‬the use of‭ ‬certain software optimizations to further increase performance.‭ ‬The process of maneuvering files to be physically contiguous is known as file descattering.‭ ‬The descattering process‭ ‬can be coupled with a defragmentation process‭ ‬to help‭ ‬create a more efficient and less wasteful file system.

When the files that make up a‭ ‬file‭ ‬sequence are spaced at many random physical points on‭ ‬a‭ ‬medium,‭ ‬they are considered to be scattered.‭ ‬File scattering can occur as a natural process of‭ ‬the computer architecture or software.‭ ‬As each file is written,‭ ‬the operating system‭ ‬will‭ ‬attempt to‭ ‬find some available space,‭ ‬but this space does not need to be sequential.‭ ‬In fact,‭ ‬the parts of a single file can be scattered over several areas.‭ ‬This can affect the file access speed and can complicate data backup procedures.

A file sequence is an integral part of the functioning of many programs that handle large amounts of data.‭ ‬They are often used in financial applications and can be used for automatically generated files‭ ‬in real-time systems or digital cameras.‭ Multimedia files or composite data files also use file sequences to assemble a‭ ‬large‭ ‬single file from many‭ ‬separate‭ ‬sources,‭ ‬some of which could have been created independently of each other.

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