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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]
Since first offered for sale in late 2000, the storage capacities of USB drives range from 8 megabytes to 256 gigabytes (GB [note 2]), 512 GB and 1 terabyte (TB [note 3]). [4] [5] As of 2024, 4 TB flash drives were the largest currently in production. [6]
The removable media's capacity must be at least 256 MB [7] (250 MB after formatting, Windows 7 reports in its Event Log a required minimum of 235 MB). Windows 7 allows up to eight devices for a maximum of 256 GB of additional memory, [8] with up to 32 GB on a single storage device. [9] The device must have an access time of 1 ms or less.
3.9.3 Storage. 3.9.4 Peripheral. ... 6 Gbit/s: 600 MB/s: 2011 CoaXPress full ... 12.8 Gbit/s: 1.6 GB/s: PC-1600 DDR SDRAM: DDR-200: 100 MHz: 100 MHz:
Historically, a byte was the number of bits used to encode a character of text in the computer, which depended on computer hardware architecture, but today it almost always means eight bits – that is, an octet. An 8-bit byte can represent 256 (2 8) distinct values, such as non-negative integers from 0 to 255, or signed integers from −128 to ...
For example, the first commercial hard drive, IBM's RAMAC in 1957, supplied 3.75 MB for $34,500, or $9,200 per megabyte. In 1989, a 40 MB hard drive cost $1200, or $30/MB. And in 2018, 4 Tb drives sold for $75, or 1.9¢/GB, an improvement of 1.5 million since 1989 and 520 million since the RAMAC.
The storage limit for ATA-1 compliant disks introduced in 1994. 1.6 × 10 12 bits (200 gigabytes) – capacity of a hard disk that would be considered average as of 2008. In 2005 a 200 GB harddisk cost US$100, [5] equivalent to $156 in 2023. As of April 2015, this is the maximum capacity of a fingernail-sized microSD card.
1 GiB of SDRAM mounted in a computer. An example of primary storage. 15 GB PATA hard disk drive (HDD) from 1999. When connected to a computer it serves as secondary storage. 160 GB SDLT tape cartridge, an example of off-line storage. When used within a robotic tape library, it is classified as tertiary storage instead.