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File size is a measure of how much data a computer file contains or how much storage space it is allocated. Typically, file size is expressed in units based on byte. A large value is often expressed with a metric prefix (as in megabyte and gigabyte) or a binary prefix (as in mebibyte and gibibyte). [1]
Thus, a representation that compresses the storage size of a file from 10 MB to 2 MB yields a space saving of 1 - 2/10 = 0.8, often notated as a percentage, 80%. For signals of indefinite size, such as streaming audio and video, the compression ratio is defined in terms of uncompressed and compressed data rates instead of data sizes:
On modern systems, all versions of Microsoft Windows including the newest (as of 2019) Windows 10 divide by 1024 and represent a 65,536-byte file as "64 KB". [9] Conversely, Mac OS X Snow Leopard and newer represent this as 66 kB, rounding to the nearest 1000 bytes. [15] File sizes are reported with decimal prefixes. [16]
2 76 bits – Maximum volume and file size in the Unix File System (UFS) and maximum disk capacity using the 64-bit LBA SCSI standard introduced in 2000 using 512-byte blocks. [20] 10 23: 1.0 × 10 23 bits – increase in information capacity when 1 joule of energy is added to a heat-bath at 1 K (−272.15 °C) [21] 2 77
Portable Document Format (PDF), standardized as ISO 32000, is a file format developed by Adobe in 1992 to present documents, including text formatting and images, in a manner independent of application software, hardware, and operating systems.
Max file size: 4,294,967,295 bytes (4 GB − 1) File size granularity: 1 byte: Max no. of files: 65,536 for 32 KB clusters: Max filename length: 8.3 filename with OEM characters, 255 UCS-2 characters [nb 1] when using LFN: Max directory depth: 32 levels or 66 characters (with CDS), 60 levels or more (without CDS) Features; Dates recorded
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