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Storage Devices Hard Disk Drives(儲存設備硬碟驅動器)

SSDs are intended to replace the traditional hard disk. They are fast and durable, and contain no moving parts. The SSD emulates a traditional hard drive and is often used in netbooks, Ultrabooks, and other lightweight systems, or machines that require fast, quiet performance. Most SSDs come in a 2.5-inch form factor, similar to a laptop hard disk, and use a 2.5-inch to 3.5-inch adapter when being placed in a desktop computer. The SSD can be built using multilevel cell (MLC) to save money, but these tend to be much slower than their more expensive and faster counterpart, the SLC (single level cell). Initially, these drives cost five to ten times as much as an equivalent-capacity traditional hard disk. Market demand and increased production have helped lower the pricing. As of the end of 2015, a 2.5-inch 250 GB SATAIII SSD can be purchased for less than $100, but the same amount of money would purchase a traditional 2 TB HDD. But, they are significantly faster and quieter, since they can access the information directly without having to wait for the hard disk to spin up and find the data on the disk.

SSD旨在替代傳統硬盤。它們既快速又耐用，並且沒有活動部件。 SSD模仿傳統的硬盤驅動器，通常用於上網本，超極本和其他輕量級系統，或需要快速，安靜性能的機器中。大多數SSD的外形尺寸為2.5英寸，類似於筆記本電腦的硬盤，並且放在台式機中時使用2.5英寸至3.5英寸的適配器。可以使用多層單元（MLC）來構建SSD，以節省資金，但是這些SSD往往比價格更高，速度更快的同類產品SLC（單層單元）慢得多。最初，這些驅動器的成本是同等容量的傳統硬盤的五至十倍。市場需求和產量增加幫助降低了定價。截至2015年底，可以以不到100美元的價格購買2.5英寸250 GB SATAIII SSD，但以同樣的金額購買傳統的2 TB HDD。但是，它們可以更快，更安靜地運行，因為它們可以直接訪問信息，而不必等待硬盤啟動並在磁盤上查找數據。
Photograph depicting a solid state drive (SSD) with solid state chips on a circuit board.
Storage Devices Drive Interfaces(儲存設備驅動器接口)

SATA is the current connection method used for hard disks and optical drives. It is called serial because only a single device can be attached to each cable, and the data is transmitted in serial fashion (one bit at a time). These devices often do not have jumpers, but if they have one, it is used to configure the speed of data transfer or to enable a special feature like spread spectrum clocking . SATA is a peripheral device and is very fast, allowing for speeds of up to 6 Gbps for the newer version, or 3 Gbps for the older versions. The data cable is shaped like an L, with seven pins for data. The power cable is also L-shaped, but has 15 pins. Internal SATA ports can be converted to an eSATA (external SATA) port simply by using a header to connect the internal port.

SATA是用於硬盤和光盤驅動器的當前連接方法。之所以稱為串行，是因為每條電纜只能連接一個設備，並且數據以串行方式（一次一位）傳輸。這些設備通常沒有跳線，但如果有跳線，則可用於配置數據傳輸速度或啟用特殊功能，例如擴頻時鐘。 SATA是外圍設備，速度非常快，新版本的速度高達6 Gbps，而舊版本的速度高達3 Gbps。數據電纜的形狀像L形，有七個用於數據傳輸的引腳。電源線也為L形，但有15針。只需使用接頭連接內部端口，即可將內部SATA端口轉換為eSATA（外部SATA）端口。
Photograph depicting a SATA drive with the circuit board and connector exposed.

SCSI, or small computer system interface, supports daisy-chaining of devices (internally or externally) with either seven devices (narrow SCSI) or 15 devices (wide SCSI). Each device in the chain is provided with a Device ID number that is configured using a selector switch, DIP (dual inline package) switch, or jumper block. SCSI is an older technology and has largely been replaced by SATA and eSATA. Narrow SCSI could only support speeds of up to 40 MBps, while wide SCSI could support up to 320 MBps.

SCSI或小型計算機系統接口支持將設備（內部或外部）與7個設備（窄SCSI）或15個設備（寬SCSI）進行菊花鏈連接。鏈中的每個設備都提供了一個設備ID編號，該ID使用選擇器開關，
DIP（雙列直插式封裝）開關或跳線塊進行配置。 SCSI是一種較舊的技術，在很大程度上
已被SATA和eSATA取代。窄SCSI只能支持高達40 MBps的速度，而寬SCSI可以支持高達320 MBps的速度。
Photograph depicting an HP Surestore DAT-drive with two blue SCSI ports on the back. There is also a power cord port and a power on/off toggle button.

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