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Message: <blockquote data-quote="naveenenushan" data-source="post: 10949120" data-attributes="member: 242002">..::Inside of the laptop hard disk::..  <img src="http://farm7.static.flickr.com/6175/6149995492_e5e4e1b62b.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /> A disk enclosure is essentially a specialized <a href="http://en.wikipedia.org/wiki/Chassis" target="_blank">chassis</a> designed to hold and power <a href="http://en.wikipedia.org/wiki/Disk_drive" target="_blank">disk drives</a>  while providing a mechanism to allow them to communicate to one or more   separate computers. Drive enclosures provide power to the drives   therein and convert the data sent across their native <a href="http://en.wikipedia.org/wiki/Computer_bus" target="_blank">data bus</a>  into a format usable by an external connection on the computer to which   it is connected. In some cases, the conversion is as trivial as   carrying a signal between different connector types. In others, it is so   complicated as to require a separate <a href="http://en.wikipedia.org/wiki/Embedded_system" target="_blank">embedded system</a> to retransmit data over connector and signal of a different standard.  <img src="http://farm7.static.flickr.com/6204/6149444979_e863785603.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /> Factory-assembled external <a href="http://en.wikipedia.org/wiki/Hard_disk_drive" target="_blank">hard disk drives</a>,   external DVD-ROM drives, and others are all built around disk   enclosures. Bulkier models built around 2.5" and 3.5" hard drives and   full-height 5.25" DVD-ROM drives use enclosures that are often nearly   identical to <a href="http://en.wikipedia.org/wiki/Original_equipment_manufacturer" target="_blank">OEM</a> enclosures.   <img src="http://farm7.static.flickr.com/6167/6149996012_f18e7af320.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /> Consumer enclosures In the consumer market, commonly used configurations of drive enclosures utilize <a href="http://en.wikipedia.org/wiki/Magnetic" target="_blank">magnetic</a> <a href="http://en.wikipedia.org/wiki/Hard_drives" target="_blank">hard drives</a> or <a href="http://en.wikipedia.org/wiki/Optical_disc_drive" target="_blank">optical disc drives</a> inside <a href="http://en.wikipedia.org/wiki/USB" target="_blank">USB</a>, <a href="http://en.wikipedia.org/wiki/FireWire" target="_blank">FireWire</a>, or <a href="http://en.wikipedia.org/wiki/Serial_ATA" target="_blank">Serial ATA</a> enclosures. External 3.5" <a href="http://en.wikipedia.org/wiki/Floppy_drive" target="_blank">floppy drives</a> are also fairly common, following a trend to not integrate floppy drives into compact and <a href="http://en.wikipedia.org/wiki/Laptop" target="_blank">laptop</a>  computers. Pre-built external drives are available through all major   manufacturers of hard drives, as well as several third-parties. These may also be referred to as a caddy – a sheath, typically plastic or metallic, within which a <a href="http://en.wikipedia.org/wiki/Hard_disk_drive" target="_blank">hard disk drive</a>  can be placed and connected with the same type of adapters as a   conventional motherboard and power supply would use. The exterior of the   caddy typically has two female sockets, used for data transfer and   power. Variants of caddy: <ul> <li data-xf-list-type="ul">some larger caddies can support  several devices at once and can  feature either separate outputs to  connect each device to a different  computer, or a single output to  connect both over the same data cable</li> <li data-xf-list-type="ul">certain caddes don't require a power supply, instead depending for power on the computer to which they are connected</li> <li data-xf-list-type="ul">some caddies have integrated fans with which to keep the drives within at a cool temperature</li> <li data-xf-list-type="ul">caddies for all major standards exist, supporting for example <a href="http://en.wikipedia.org/wiki/AT_Attachment" target="_blank">ATA</a>, <a href="http://en.wikipedia.org/wiki/SCSI" target="_blank">SCSI</a> and <a href="http://en.wikipedia.org/wiki/S-ATA" target="_blank">S-ATA</a> drives and <a href="http://en.wikipedia.org/wiki/USB" target="_blank">USB</a>, SCSI and <a href="http://en.wikipedia.org/wiki/FireWire" target="_blank">FireWire</a> outputs</li> </ul>Advantages: <ul> <li data-xf-list-type="ul">relatively high transfer speed;  typically faster than other common  portable media such as CDs, DVDs and  USB flash drives, slower than  drives connected using solely ATA, SCSI  and S-ATA connectors</li> <li data-xf-list-type="ul">storage; typically larger than <a href="http://en.wikipedia.org/wiki/CD" target="_blank">CDs</a>, <a href="http://en.wikipedia.org/wiki/DVD" target="_blank">DVDs</a> and <a href="http://en.wikipedia.org/wiki/USB_flash_drive" target="_blank">USB flash drives</a></li> <li data-xf-list-type="ul">price-to-storage ratio; typically better than CDs, DVDs and USB flash drives</li> </ul>Disadvantages: <ul> <li data-xf-list-type="ul">power; most variants require a supply, unlike CDs, DVDs and USB flash drives...</li> <li data-xf-list-type="ul">size; typically larger than CDs, DVDs and USB flash drives</li> </ul><img src="http://farm7.static.flickr.com/6163/6149995710_0072cde19e.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />  <a href="http://www.youtube.com/watch?v=nDfFnEdyTJA&feature=player_embedded" target="_blank">http://www.youtube.com/watch?v=nDfFnEdyTJA</a><a href="http://www.youtube.com/watch?v=fr6LmpuTN8E&feature=player_embedded" target="_blank">http://www.youtube.com/watch?v=fr6LmpuTN8E</a><a href="http://www.youtube.com/watch?v=Kyrofl4m2pE&feature=player_embedded" target="_blank">http://www.youtube.com/watch?v=Kyrofl4m2pE</a></blockquote>

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