However, there's no requirement for the SSD to match the shape of a typical HDD form factor. Internal circuit board of 1.8″ and 2.5″ SSD without the case The SSDs also use standard SATA connectors, but note that the SATA connector for 1.8" devices is narrower than the 2.5" devices to accommodate the smaller width. The two SSDs shown below are form factor identical twins-without the outer casing-to 1.8" and 2.5" HDDs. When solid state drives first started replacing HDDs, they had to fit into computer chassis or laptop drive bays built for HDDs, so they had to conform to HDD dimensions. Those 8" HDDs for datacenter storage and desktop PCs shed size to 5" to today's 3.5", and laptop HDDs, starting at 2.5", are now as small as 1.8". The computer industry used the platter diameter dimensions to describe the HDD form factors, and those contours shrank over the years. Over time the standard size of the magnetic patter diameter shrank, which allowed the HDD width to decrease as well. The height was dictated by the number of platters stacked on the motor (about 14 for the largest configurations). Overseeing all outbound marketing and performance analysis for the company. This is a guest post by Kent Smith, senior director of marketing for LSI's Flash Components Division,
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