3.3 Optical Drives Flashcards
What are optical drives?
Devices that read/write data using laser light on optical discs.
What are common types of optical discs?
CD, DVD, Blu-ray.
What is the typical storage capacity of a CD?
650-700 MB (74-80 minutes of music).
What type of laser does a CD use?
Infrared, long wavelength.
What is the typical storage capacity of a DVD?
4.7 GB (single-layer), 8.4 GB (dual-layer).
What type of laser does a DVD use?
Red, medium wavelength.
What is the typical storage capacity of a Blu-ray disc?
25 GB (single-layer), 50 GB (dual-layer).
What type of laser does a Blu-ray disc use?
Blue, short wavelength.
What is a read-only (ROM) disc?
A disc pre-written with data that cannot be modified (e.g., CD-ROM, DVD-ROM, BD-ROM).
What is a write-once (R) disc?
A disc where data can be written once but not erased (e.g., CD-R, DVD-R, BD-R).
What is a write-many (RW/RAM/RE) disc?
A disc that allows data to be written, erased, and rewritten (e.g., CD-RW, DVD-RW, BD-RE).
What is the base speed (1X) of a CD drive?
150 KB/s.
What is the maximum speed of a CD drive?
~52X (7.8 MB/s).
What is the base speed (1X) of a DVD drive?
1.385 MB/s.
What is the typical speed of a DVD drive?
~24X (33.2 MB/s).
What is the base speed (1X) of a Blu-ray drive?
4.5 MB/s.
What is the typical speed of a Blu-ray drive?
~8X (36 MB/s).
Where are internal optical drives installed?
In 5.25-inch internal bays.
What type of connections do internal optical drives use?
SATA data and power cables.
How are external optical drives connected?
Via USB or USB-C.
What is the best optical disc for storing 17 GB of data?
Blu-ray (dual-layer, 50 GB capacity).
What are CDs commonly used for?
Music and small data files.
What are DVDs commonly used for?
Standard-definition movies and medium-sized data storage.
What are Blu-rays commonly used for?
HD/4K movies and large data storage.
What are the advantages of external optical drives?
Useful for systems without internal bays; portable and easy to connect.
What is the main limitation of optical discs compared to modern storage?
Lower storage capacity and slower read/write speeds.
