A Quick Guide To Identifying SCSI Interfaces
If you are looking for the new SAS or SCSI hard disk drive for one’s or business use, it can be challenging discover which product you should be trying to find. This post is should have been brief help guide identifying and distinguishing between SCSI and SAS plus the different variations of SCSI connections.
The first industry standard interface, the 50 pin SCSI harddrive is an extremely old product. You are able to, however, still see them today, whilst they typically offer reduced storage capacity than modern SCSI harddrive products. The first sizes of those devices were only around 4.5 GB to 9 GB, reaching as much as 18 GB.
Nowadays, SCSI is accessible as much as 300 GB, the difference using the 1st models. You can find old 50 pin SCSI drive products in SUN, Unix, Amiga and SGI machines. A lot of the 50 pin disks around nowadays are 3.5″ half height form factor.
Next will be the 68 pin SCSI hard disk drive, and this is called the SCSI-2. It is really an Ultra Wide form of interface, and it was widely used from 1994 onwards which is still used today. These disks, however, are being eliminated, even though there are still several brand-new disks still to be found.
The size and style selection of the 68 pin SCSI harddrive originates from 18 GB to up to 300 GB, and other models can be found in numerous online and hardware stores worldwide. These kinds of disks were quickly re-invented and adapted after their initial appearance on the market, using the 80 pin SCA connector launched inside the 1990s.
The 80 pin SCSI hard disk carries a single connector attachment, also known as SCA or hot plug. These folks were developed mainly for server use since they had merely one D connector that sat right in the centre from the board around the disk. This single connector had power, SCSI ID and SCSI bus all rolled right into a single connection.
As this disk required merely one connector that interfaced together with the server’s back plane and powered up, this differentiated it in the 50 pin and 68 pin SCSI harddrive, as both versions needed a separate cable for power as well as the data interface.
Due to this, the idea of “Hot Pluggable” Disk trays or caddies were utilized to store the 80 pin SCSI drives, so it had been a simple and straightforward task of pushing the disks interior and exterior the server disk bays. Such a SCSI hard disk is popular today in HP, Dell, IBM, Sun and much more servers.
The 80 pin SCSI drive, however, never was developed to a capacity greater than 300 GB, which means that a new innovation as necessary. This is how SAS will come in, and is also used in most of the newer servers today.
In addition to the 80 pin hot pluggable SCSI drive, it has an adaptor or convertor which you can use to manipulate how the tunnelling of SCSI is utilized and so transform the 80 pin disk into either the 68 pin or even the 50 pin SCSI drive. It includes a single board that clips easily on the SCA connector of any 80 pin SCSI disk, and could be very handy for bandwith and recovery.
This is simply a simple breakdown of the SCSI hard drive interface and the different products in the marketplace today. If seeking to replace or upgrade your product, it is always advisable to seek expert help and guidance from a trusted retailer and other expert when you have any doubts. This will likely make certain you buy the appropriate product for your machine along with your specific purposes.