What Is ST-506 Interface?
You were only cool if your computer had an ST-506 interface. If you had one, you were a total nerd. It was like the Mac of hard drive controllers: everyone wanted it, but no one had it. You were a nerd if you did have one, but at least you could brag about how much RAM your computer had. The ST-506 interface was a standard hard disk controller (HDC), and the ST-506 interface was used to connect personal computers (PC) and hard disk drives (HDD). It attached to a controller card with two cables and a third power cable and was the first five-and-a-quarter-inch hard disk drive by Seagate Technology, formerly Shugart Technology. The interface was developed in 1980 and released in 1982. The first HDDs were available in 10MB, 20MB and 30MB. By 1991, the maximum capacity had increased to 1GB for 5¼" drives and 2GB for 3½" drives. Shugart Technology initially conceived the interface as an alternative to the existing floppy drive interface. Still, IBM rejected it because it was incompatible with their system/370 architecture. However, IBM adopted an updated version of the same interface known as Micro Channel Architecture for its PS/2 series. In the early 1980s, Shugart's SA1000 hard disk drive interface was a big hit. It was easy to design controllers for and compatible with the five-and-a-quarter-inch floppy drive standard. It meant anyone could create an HDD controller without learning anything new. The ST-506 interface was derived from Shugart's SA1000 interface, which in turn was derived from the five-and-a-quarter-inch floppy drive interface - facilitating easy disk controller design. The ST-506, ST-412 and ST-412RLL interfaces were de facto HDD standards through the 1990s. Unlike modern hard disk drive systems, onboard processing power was not provided, which was a non-issue during that period.
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