Solid hard drive SSD (Solid State Drive) is the groundbreaking developments about the storage of your computer, bring many advantages such as: shock, operate more softness, more durable and higher access speeds, thereby markedly increasing the overall performance of the system.SSD drives have become more common, from a product which just for the faithful the technology has become popular, thanks to the improvement of the price, capacity as well as the size for both PC and laptop. SSD at first called Serial ATA or SATA.First appeared in 2003 and gradually improved SSD speed from 150 MB/s up to 600 MB/s and up to 1 GB/s allows you to access your PC ultra-fast and enhance your system's overall response.Can drive SSD hard drive type is solid is made from many "Non-volatile" memory chip (chip memory does not change), the drive will record and save data in the flash chip, so that retrieval of data takes place almost immediately whether the drive has fragmented after a period of use.In addition, SSD will help your computer faster feedback: launch, faster application load and shuts down faster. In addition to the start/off (start/shut down) the faster OS, the access to the application program installed, open Word, Excel, Visual Studio, SQL, Photoshop ... much faster.There are two types of memory chips that are used in the fabrication of SSD drive: NAND memory SLC (Single-Level Cell) memory drives one level often – the business use because of the higher price (3 USD/GB) and NAND MLC (multi-level Cell)-multi-level memory drives are normal users use (~ 1 USD/GB).In it, the chip SLC only retain 1 bit/transistor (0 or 1) and the MLC chips contained 2 bits per transistor (00, 01, 10, and 11). Therefore, the amount of data stored by MLC more than double chip chip SLC but the average reading speed is slower than the two times (2 x) and the write speed will slow down more than three times (3 x) on a cell NAND memory.Về công nghệ, SSD hoàn toàn khác biệt HDD, thay vì cấu tạo từ những phiến đĩa chứa dữ liệu xếp chồng lên nhau theo trục đứng như HDD, SSD được cấu tạo từ các chip flash, do đó trên SSD không có khái niệm phân mảnh ổ đĩa, bộ nhớ flash được xem là “ứng cử viên” nặng ký để thay thế HDD truyền thống với tốc độ đọc/ghi và thông lượng nhập xuất (IOPS) vượt trội.
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