Pivot table not updating 2016 shutdown pc while updating

23-Sep-2017 02:00

More than 200 companies have produced HDDs historically, though after extensive industry consolidation most current units are manufactured by Seagate, Toshiba, and Western Digital.

HDD unit shipments and sales revenues are declining, though production (exabytes per year) is growing.

Most HDDs in the early 1980s were sold to PC end users as an external, add-on subsystem.

The subsystem was not sold under the drive manufacturer's name but under the subsystem manufacturer's name such as Corvus Systems and Tallgrass Technologies, or under the PC system manufacturer's name such as the Apple Pro File.

HDDs are connected to systems by standard interface cables such as PATA (Parallel ATA), SATA (Serial ATA), USB or SAS (Serial Attached SCSI) cables.

, IBM announced HDDs in 1956 as a component of the IBM 305 RAMAC system and as new component to enhance the existing IBM 650 system, a general-purpose mainframe.

The latter were primarily intended for the then-fledgling personal computer (PC) market.

As the 1980s began, HDDs were a rare and very expensive additional feature in PCs, but by the late 1980s their cost had been reduced to the point where they were standard on all but the cheapest computers.

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The two most common form factors for modern HDDs are 3.5-inch, for desktop computers, and 2.5-inch, primarily for laptops.

is a data storage device that uses magnetic storage to store and retrieve digital information using one or more rigid rapidly rotating disks (platters) coated with magnetic material.

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