Storage device: solid-state drive (SSD) and Compact Disc (CD)

This post is lesson 34 of 42 in the subject Computer Hardware

Storage devices used to store operating system, software, data, etc. Storage devices is also known as secondary memory or external memory. They are non-volatile memory. There are many storage devices such as floppy disk, hard drive, SSD, optical disc, USB, etc. This article will present the features of solid-state drive (SSD) and Compact Disc (CD).

1. SSD (Solid State Drive)

SSD consists of many memory chips, using flash memory to store data. This storage device has faster data access speed than HDD.

Hard disk drive (HDD) and Solid-state drive (SSD)

Internal flash memory in SSD

It is non-volatile memory that can be erased and reprogrammed. Flash memory includes NAND and NOR gates, which are logic gates.

Internal flash memory in SSD

Architecture of SSD

The important component is the Flash Controller and many Flash memory chips.

SSD architecture

Types of connectors of SSD


SATA 3 includes 7 data pins and 15 power pins. According to the size, there are 3.5 inch, 2.5 inch types.


Micro SATA

It is 1.8 inches in size. Micro SATA includes 7 data pins and (7+2) power pins. It usually has a SATA to Micro SATA converter.

Micro SATA of SDD


It is a miniature connector of 2.5 inch SSD. mSATA also includes 7 data pins and 15 power pins.



M.2 SATA has 3 types: 2242, 2260 and 2280. They have default width is 22mm and variable length is 42mm, 60mm, 80mm respectively. They includes 6 pins + 19 pins + 5 pins.



It also known as M.2 PCIe. M.2 NVME includes 29 pins + 5 pins.


2. OD drive (Optical Disc Drive)

OD drive has function that read/write data of optical disc. Data of optical disc is read/written by converging of light rays. The optical drive composes of two parts: the mechanical part and the electrical circuit.

OD drive

CD-ROM (Compact Disc Read-Only Memory) consists of a pre-pressed optical compact disc that contains data. It has a diameter of 120, 80 mm. CD-ROM has a storage capacity of 650-700MB.

Compact Disc

Classification of compact disc

  • CD Recordable (CD-R): data recorded in bit by bit, laser recorded. CD-R is recorded once, can continue recording if space is available.
  • CD Rewritable (CD-RW): data can be erased, rewritten many times.
  • DVD (Digital Versatile Disc or Digital Video Disc): an optical disc storage similar to a compact disc. But DVD has bigger data storage capacities as well as with higher quality of video and audio formats. Types of DVD are DVD-R, DVD-RW. Capable of storing over 4GB (theoretical 4.7GB, actual 4.3GB).
5/5 - (2 votes)
Previous and next lesson in subject<< Storage device: floppy disk drive (FDD) and hard disk drive (HDD)Some common peripherals of computer >>
Posted by Vinh Le

Composer at ITLearningCorner.

Leave a Reply

Your email address will not be published. Required fields are marked *