PC COMPONENTSDISK DRIVES AND CONNECTORS

HARD DISK DRIVES• Common Hard Drive Types:

– ESDI - Enhanced Small Device Interface Old Technology

– IDE - Integrated Drive Electronics 90% of all drives

– EIDE - Enhanced IDE – SCSI - Small Computer Systems Interface

DISK TERMS

• Sectors– The minimum unit of data that you can read

from or write to a disk. Sectors are organized into 512 byte groups.

• Tracks – Groups of sectors. The number of tracks is

dependant on the size of the disk drive.

DISK TERMS

• Cylinders– Groups of tracks

• Heads– Electromagnetic “heads” that read and write to

the disk

DRIVE INTERFACES

Common Interfaces:• SCSI

– Small Computer Systems Interface

• IDE – Integrated Drive Electronics

• EIDE– Enhanced Integrated Drive Electronics

CMOS (BIOS) SETTINGS

•Information needed for hard drive setting:

– Drive type number– Number of heads – Number of cylinders

There are many common types of floppy disk drives used to store data:• 3.5”

– 720 K (older technology)– 1.44 MB– 2.88 MB

• 5.25” (older technology)– 360 K– 1.2 MB

FLOPPY DISK DRIVES

FLOPPY DISK DRIVE CABLE RULES

• Drive A: connector at the end of the cable

• Drive B: connector in the middle of the cable

FLOPPY DISK DRIVE CABLE

EXTERNAL COMPONENTS

• Keyboard• Mouse• Monitor• Modem (internal/external)• Video Card• Sound Card• CD-ROM Drive

CONNECTORS Centronics Connector

DIN Connector

25 Pin Male/FemaleD Shell Connector

9 Pin Male/FemaleD Shell Connector

CONNECTORS

CONNECTORS

15 Pin (3 rows) Female D Shell Connector

CONNECTORS

50 - 68 Pin Female D Shell Connector