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An external hard drive enclosure that uses a 2.5-in drive and a USB connection for power and transfer. Key benefits to using external disk enclosures include: Adding additional storage space and media types to small form factor and laptop computers, as well as sealed embedded systems such as digital video recorders [1] and video game consoles. [2]
The SAS is a new generation serial communication protocol for devices designed to allow for much higher speed data transfers and is compatible with SATA. SAS uses a mechanically identical data and power connector to standard 3.5-inch SATA1/SATA2 HDDs, and many server-oriented SAS RAID controllers are also capable of addressing SATA hard drives.
securing a 3.5-inch hard disk drive to the case; holding an expansion card in place by its metal slot cover; fastening case components to one another; usually, one or more #6-32 UNC screws hold the main cover on the case; They are almost always provided with a #2 Phillips drive. Sometimes a Green Robertson or Torx drive is used instead. All ...
A single "tri-mode" (PCIe/SATA/SAS) backplane receptacle can handle all three types of connections; the controller automatically detects the type of connection used. This is unlike U.2, where users need to use separate controllers for SATA/SAS and NVMe. U.3 devices are required to be backwards-compatible with U.2 hosts.
The Serial ATA interface was designed primarily for interfacing with hard disk drives (HDDs), doubling its native speed with each major revision: maximum SATA transfer speeds went from 1.5 Gbit/s in SATA 1.0 (standardized in 2003), through 3 Gbit/s in SATA 2.0 (standardized in 2004), to 6 Gbit/s as provided by SATA 3.0 (standardized in 2009). [9]
The capacity of hard drives has grown exponentially over time. When hard drives became available for personal computers, they offered 5-megabyte capacity. During the mid-1990s the typical hard disk drive for a PC had a capacity in the range of 500 megabyte to 1 gigabyte. [6] As of February 2025 hard disk drives up to 36 TB were available. [7]