Hard Drives: Ata versus Sata
The execution of computer systems has been steadily expanding as faster processors, memory, and video cards are continuously being developed. The one key component that is often neglected when looking at improving the execution of a computer ideas is the hard drive. Hard drive manufacturers have been enduringly evolving the basic hard drive used in contemporary computer systems for the last 25 years, and the last few years have seen some interesting developments from faster spindle speeds, larger caches, best reliability, and increased data transmission speeds.
Router D Handle
The drive type used most in consumer grade computers is the hearty Ata type drive (commonly called an Ide drive). The Ata approved dates back to 1986 and is based on a 16-bit parallel interface has undergone many evolutions since its introduction to increase the speed and size of the drives that it can support. The most recent approved is Ata-7 (first introduced in 2001 by the T13 Technical Committee (the group responsible for the Ata standard)) which supports data change rates up to 133Mb/sec. This is unbelievable to be the last update for the parallel Ata standard.
As long ago as 2000 it was seen that the parallel Ata approved was maxing out its limitations as to what it could handle. With data rates hitting the 133Mb/sec mark on a parallel cable, you are interesting all sorts of problems because of signal timing, Emi (electromagnetic interference) and other data integrity issues; thus industry leaders got together and came up with a new approved known as Serial Ata (Sata). Sata has only been around a few years, but is destined to come to be "the standard" due to several benefits to be addressed in this Tech Tip.
The two technologies that we will be looking at are:
Ata (Advanced Technology Attachment) - a 16-bit parallel interface used for controlling computer drives. Introduced in 1986, it has undergone many evolutions in the last 18+ years, with the most recent version being called Ata-7. Wherever an item is referred to as being an Ata device, it is ordinarily a Parallel Ata device. Ata devices are also ordinarily called Ide, Eide, Ultra-Ata, Ultra-Dma, Atapi, Pata, etc. (each of these acronyms surely do refer to very specific items, but are ordinarily interchanged)
Sata (Serial advanced Technology Attachment) - a 1-bit serial evolution of the Parallel Ata physical storage interface.
Basic Features & Connections
Sata drives are easy to distinguish from their Ata cousins by the distinct data and power connections found on the back of the drives. A side-by-side comparison of the two interfaces can be seen in this Pdf from Maxtor, and the following covers many of the differences...
Standard Ata drives, such as this 200Gb Western Digital model, have somewhat bulky, two inch wide ribbon cable with 40-pin data connections and receive the 5V primary to power them from the customary 4-pin connection. The basic data cables for these drives have looked the same for years. A turn was made with the introduction of the Ata-5 approved to best improve the signal potential by production an 80 wire cable used on the 40-pin connector (these are ordinarily called 40-pin/80-wire cables). To improve airflow within the computer ideas some manufacturers resorted to surely folding over the ribbon cable and taping it into that position. an additional one new physical turn also came with the coming of rounded cables. The execution of the rounded cables is equal to that of the flat ribbon, but many prefer the improved ideas air flow afforded, ease of wire management, and cooler appearance that come with them.
Sata drives, such as this 120Gb Western Digital model, have a half inch wide, 7 "blade and beam" data connection, which results in a much thinner and easier to carry on data cable. These cables take the convenience of the Ata rounded cables to the next level by being even narrower, more flexible and capable of being longer without fear of data loss. Sata cables have a maximum length of 1 meter (39.37 inches), which is much greater than the recommended 18 inch cable for Ata drives. The reduced footprint of Sata data connections frees up space on motherboards, potentially allowing for more suitable layouts and room for more onboard features!
A 15-pin power relationship delivers the 250mV of primary power to Sata drives. 15-pins for a Sata gismo sounds like it would wish a much larger power cable than a 4-pin Ata device, but in reality the two power connectors are just about the same height. For the time being, many Sata drives are also coming with a heritage 4-pin power connector for convenience.
Many contemporary motherboards, such as this Chaintech motherboard, come with Sata drive connections onboard (many also together with the Ata connectors as well for heritage drive compatibility), and new power supplies, such as this Ultra X-Connect, ordinarily highlight a few of the primary 15-pin power connections, production it easy to use these drives on new systems. Older systems can surely be upgraded to retain Sata drives by use of adapters, such as this Pci slot Sata controller and this 4-pin to 15-pin Sata power adapter.
Optical drives are also becoming more readily available with Sata connections. Drives such as the Plextor Px-712Sa take benefit of the new interface, although the execution will not be any greater than a comparable visual drive with an Ata connection.
Performance
In expanding to being more suitable to install and drawing less power, Sata drives have execution benefits that surely set them apart from Ata drives.
The most interesting execution highlight of Sata is the maximum bandwidth possible. As we have noted, the evolution of Ata drives has seen the data change rate reach its maximum at 133 Mb/second, where the current Sata approved provides data transfers of up to 150 Mb/second. The farranging execution increase of Sata over Ata can currently be unbelievable to be up to 5% (according to Seagate), but improvements in Sata technology will surely improve on that.
The future of Sata holds great things for those wanting even more speed, as drives with 300 Mb/second change rates (Sata Ii) will be readily available in 2005, and by 2008 speeds of up to 600 Mb/second can be expected. Those speeds are incredible, and are hard to dream at this point.
Another execution benefit found on Sata drives is their built-in hot-swap capabilities. Sata drives can be brought on and offline without shutting down the computer system, providing a serious benefit to those who can't afford downtime, or who want to move drives in and out of execution quickly. The higher estimate of wires in the power relationship is partially explained by this, as six of the fifteen wires are dedicated to allowing the hot-swap feature.
Price
Comparing Ata drives to Sata drives can be tricky given all of the variables, but in normal it is the case that Sata drives will still cost just a bit more than a comparable Ata drive. The gap is windup rapidly though, and as Sata drives gain in popularity and availability a clear shift in prices can be expected. considering the benefits of Sata over Ata, the inherent contrast of a few dollars can surely be justified when considering an upgrade. Computer Geeks currently has a tiny option of Sata drives, but several technical sites, such as The Tech Zone and The Tech Lounge, offer real time price guides to see how comparable drives stack up.
Final Words
The current Sata approved provides primary benefits over Ata in terms of convenience, power consumption and, most importantly, performance. The main thing Ata has going for it right now is history, as it has been the approved for so long that it will not likely disappear any time soon. The future of Sata will be even more interesting as speed increases will help hard drive amelioration keep pace with other key ideas components.
Ata vs Sata