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They are based on rotating magnetic platters and reading heads.
However, 7,200 rpm HDDs for laptops are a rarity on the market and don’t improve overall performance much.Since hard disk drives are mechanical devices and notebooks are meant to be carried around, manufacturers have to use enhanced HDD shock protection technologies to prevent data loses caused by accidental drops.The most common hard drive capacity in today’s laptops is 1 Terabyte (TB) or 1,000 Gigabytes (GB).On the positive side, HDD is the cheapest kind of storage.A rotational speed of platters of 5,400 rounds-per-minute is the standard one for laptop-use hard drives.SSDs in the latest notebooks come in two form factors: While almost all notebooks have a 2.5” storage bay, those supporting only M.2 format are select thin-and-light computers.
A relatively new technology on the storage market is NVMe.
Besides rotational speed, size of an HDD’s cache memory which is usually either 8GB or 16MB, also affects performance.
Laptop hard drives come in the 2.5-inch form factor and are connected to the rest of the PC systems via the SATA III interface, which replaced SATA II years ago.
Many of the cheap laptops come with a smaller 500 GB hard drive, while 2 TB size is occasionally used in some more expensive notebooks.
Solid State Drive (SSD) Storage Solid state drive-based storage is newer technology than the decades old hard drive storage.
It these laptops, PC makers usually pair an empty 2.5” hard drive with an M.2 solid state drive with operating system and programs installed on it.