CD drive

Speed of CD Drive

Normally CDD speeds are mentioned as:-

32x  = 32 * 150 kbps = 4800kbps

Where ‘x’ is 150 Kbps

CD R/W speed

52 x 24 x 52

First 52 stand for the speed of CDR

Second 24 stands for  the speed of CD R/W

Third 52 stands for reading speed of all CD’s.

DVD specification

Normally DVD speed is mentioned as:-

12X

Where X is = 1350kbps

COMBO DRIVE = CD ROM + CD R + CD R/W + CD writing + DVD read

DVD  writer = COMBO + DVD writing

CD STANDARDS

The standards of CD’s are commonly known by the color of the books that describe them.  There exists the following standards:-

1. Red book – Audio CD
2. Yellow book – Data CD
3. Green book – Interactive CD
4. Blue book – Multi session CD
5. White book – VCD
6. Orange book – CD-R, CD-R/W

FILE SYSTEM

File system is a set of program, which organize, retrieves, maintains and secure files stored in storage devices. 

Types of file systems:-

Following types of file systems are available:-

1. FAT (FAT 16)
2. VFAT (Virtual FAT)
3. FAT 32
4. NTFS

FAT

Maximum partition size = 2GB

Maximum Files in root directory = 512 Nos.

Maximum files in non-root directory = 65,535 Nos.

File name 8.3 pattern

Below 50mb FAT 12.

VFAT

Maximum partition size = 4 GB

LFN (Long File Name) support = Yes

FAT 32

Partition size = 4TB

LFN = yes

NTFS (New Technology File System)

Maximum partition size = 16 Hexabyte

File level security = yes

Local security = yes

POSIX support = yes (Case sensitivity)

File level compression = Yes

CLUSTER

Minimum space  allocated for a new file within the drive.   

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