Technology is moving along at a fast pace, especially in the field of computing. The hard disk drive (HDD) is an important component of the computer, whether it is a notepad, a laptop, or a desktop, since it stores the operating system... necessary to run the computer... along with other programs that the user needs for his work. The first hard drive was a gargantuan with the ability to store 20MB of data. Its dimensions were about 4 inches by 6 inches. Technology has moved far ahead since then. The current models of hard drives are smaller than a cigarette pack and have the ability to store Terabytes of data.

One Terabyte HDD

For the uninitiated, one Terabyte equals to 1024 Gigabytes. Every couple of months some company or the other announces the launch of a new hard disk drive, boasting of an increased storage limit than other models available in the market. These drives transfer data between themselves and the CPU or any other portable storage device much faster. This has been possible due to the new types of interfaces launched over the past few years. The sas drives use the latest technology to transfer data between itself and the CPU and RAM at blistering speeds.

Read more about sas drives

The system interface

Each device requires a special port on the motherboard for connecting with it. A special cable that supports a particular interface connects the device with the motherboard. The small computer system interface was a popular interface used by UNIX systems, PCs, and Macintosh computers with other peripheral devices, such as printers and hard disk drives. This interface permits a maximum data transmission rate of 80 MBS (megabytes per second). This system did not have the drive controller unit integrated in the hard disk drive.


The arrival of the ATA (advanced technology attachment) changed this, but the interface remained the same. An ATA compliant HDD comes integrated with the drive controller. It is possible to connect other peripherals such as CD-ROM that support the 816 interface. An ATA-6 interface allows data transfer at speeds up to 100 megabytes per second. This was followed by SATA (serial ATA) and PATA (parallel ATA). A PATA drive ca transfer data in excess of 150 megabytes per second. The SAS interface changed the rules of the game.

CGI Script Formmail data transferring with SAS

A typical SAS allows data transmission at speeds up to 3.0 gigabytes per second. This interface also allows multilinking of up to 128 devices. It also removes the constraint on the length of the cable that was a hindrance with ATA and SATA interfaces. The greatest advantage of the SAS hard disk drive is that the user can connect it even when the computer is running. The technical jargon for this is hot plugging. In simple language, it is possible to plug SAS drives into a running computer, copy data, unplug it, and then connect it to a different computer for transferring data. Unlike the past, the user does not need to shut down any computer for copying and pasting data. This type of drive is a boon for system administrators who use Formmail, a type of CGI script, which processes the contents of an online form and sends an email to the recipient. The plug and play capacity of the SAS drives allows the system administrator to copy the data collected through Formmail and save it safely on a different computer.