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Read/write head from circa-1998 Fujitsu 3.5" hard disk (approx. 2.0 mm x 3.0 mm) Microphotograph of an older generation hard disk drive head and slider (1990s) Noises from an old hard drive while attempting to read data from bad sectors. During normal operation, heads in HDDs fly above the data recorded on the disks.
On 5 January 1975, the 12-bit field that had been used for dates in the TOPS-10 operating system for DEC PDP-10 computers overflowed, in a bug known as "DATE75". The field value was calculated by taking the number of years since 1964, multiplying by 12, adding the number of months since January, multiplying by 31, and adding the number of days since the start of the month; putting 2 12 − 1 ...
The computer tries to interpret the noise as a data bit, which can cause errors in addressing or processing program code. The bad data bit can even be saved in memory and cause problems at a later time.
Sales volume worldwide grew rapidly in the late 1990s but declined briefly around the early 2000s recession. Sales increased again for the rest of the decade though more slowly during the late 2000s recession. After substantial growth in 2010, sales volume started declining in 2012 which continued for seven consecutive years until 2019.
The laptop came with a 20 MB hard drive, 1 MB of RAM, a 1.44M/720K switchable 3.5" floppy drive, and a blue-on-white, back-lit, "Toshiba Graphics" 640x400 STN LCD. The laptop came with a choice of either MS-DOS 3.3 or 4.01 stored in a socketed ROM. The laptop's RAM was expandable to 2 MB, 3 MB, 5 MB, or 9 MB with 1 MB, 2 MB, 4 MB, and 8 MB ...
Also in 1961, Bryant Computer Products introduced its 4000 series disk drives. These massive units stood 52 inches (1.3 m) tall, 70 inches (1.8 m) long, and 70 inches (1.8 m) wide, and had up to 26 platters, each 39 inches (0.99 m) in diameter, rotating at up to 1,200 rpm. Access times were from 50 to 205 milliseconds (ms). The drive's total ...
The first "laptop-sized notebook computer" was the Epson HX-20, [12] [13] invented (patented) by Suwa Seikosha's Yukio Yokozawa in July 1980, [14] introduced at the COMDEX computer show in Las Vegas by Japanese company Seiko Epson in 1981, [15] [13] and released in July 1982.
High productivity growth occurred from last decades of the 19th century until the 1973, with a peak from 1929 to 1973, then declined to levels of the early 19th century. [ 13 ] [ 14 ] However, the hypothesis that IT was fundamentally unproductive weakened in the early 1990s, as total factor productivity growth in the United States accelerated.