The hard disk drives can be classifieds basically of two types. One is the internal hard disk drive and the other is the external hard disk drive. The difference between the two is that the internal hard disk drive is located in the computer case and the external hard disk drive comes along a casing over it. The internal hard disk drive has an interface adapter that can be an ATA/IDE, SCSI or any other interface. The connector in case of the external hard disk drive is usually a USB. The internal hard disk is a must in any computer system; where as the external is usually used for the back up or the archival of the data. The external hard disk is useful in the cases where the data transfer is essential and there is no network available.

The huge quantity of the data that needs to be shifted from one place to another may require a device that has large storage capacity. The internal hard disk drive should be used for the installation of the operating system. The internal hard disk drives have a data cable as well as the power cable that is used to power the hard disk drive through the SMPS that is the Switch Mode Power Supply.

The internal hard disk drive require a specific place in the computer cabinet case. The external hard disk drive is never placed inside the cabinet but is always placed outside the computer case. The connection as mentioned is carried out through the USB connector. The other important aspect of the internal drive is the jumper settings that should be made for the drive to work. The jumper settings can be master or slave.

In case of the external drives it is simple plug and play device that can be attached to the computer system as and when required. The computer case has a USB port that is used for the connection of hard disk drive. There is power supply that is required also in the case of the external hard disk drive. The power supply may be the input that is provided as a DC. An adaptor may be used for the conversion of the AC voltage to the DC voltage.

The jumper settings in the case of the external hard disk drive are not required since the information of master or slave not at all exists. The master/slave combination in the case of the internal hard disk drive is a must sine the computer needs the information from which drive to boot. The master hard disk drive has the Master Boot Record – MBR which consists of the information to boot the computer system.

Such information of master/slave is not required in the case of the external hard disk drive. Even in a situation where in the internal hard disk drive is not present inside the computer and the external hard disk drive is used for the loading of the operating system then the also the jumper settings are not required. The system BIOS automatically loads the operating system if the information of the first boot device as is USB in the BIOS. There is a hard casing that is provided as the cover over the hard disk drive. This casing itself has the power connections and the data cable connections. The casing is provided so as to survive any physical damage.

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