HDD(Hard Disk Drive)

WHAT IS A HARD DISK?

Hard disk or hard drive is an essential part of every computer desktop and server. And its functionality is to store very much amount of digital data in a non-volatile form, so that data can be retained when the computer is powered off. 

TYPES OF HARD DISKS 

HDD are categorized by there interfaces.  

Types of hard disk interfaces

Desktop Hard Disk Types: 3.5', IDE and Sata Interfaces

Laptop Hard Disk Types:2.5', 1.8', IDE, Sata, SCSI

Server Hard Disk types:3.5' Sata, SCSI

The three common disk rotation speeds are 5400 rpm, 7200 rpm, and 10000 rpms

5400 rpm Hard Disk Drives found in Laptop.

7200 rpm Hard Drives found in desktop computers

10000 rpm Drives found in work stations, enterprise systems.

Manufacturer of HDD:

Adtron Corporation {SATA 2.5", SCSI 2.5"/3.5", Solid State IDE 2.5" UDMA-100, IDE 3.5" UDMA-66, RAID}

Fujitsu {Mobile IDE, SATA - Enterprise SAS}

Hitachi {Server Drives ~ Ultra320 SCSI, SATA II, ATA-5, 3.5", 2.5", 1.8 inch hard disk drive}

HP{SATA, ATA/100, SAN}

Quantum {Disk-based backup systems-Networks}

Samsung {Hard Disk Drive SATA, SAS, Ultra ATA - 100, 3.5" desktop, 2.5" Laptop, 3.5" SATA enterprise, 1.8" SATA, SSD}

Seagate Disc Storage {Serial Attached SCSI (SAS), Ultra320 SCSI and 2 Gbits/sec Fibre Channel interfaces, SATA, Ultra ATA/100}

Toshiba Hard Drives {0.85", 1.8" 100MBps Ultra DMA, 2.5 inch ATA-2/3/4/5/6 interface}

Western Digital Corp. {SATA 150MBps, SATA 300MBPS, EIDE Drive, Enterprise, Desktop, Mobile, External Hard Disk Drives}