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Some early SATA drives included the four-pin Molex power connector together with the new fifteen-pin connector, but most SATA drives now have only the latter. The new SATA power connector contains many more pins for several reasons: [50] 3.3 V is supplied along with the traditional 5 V and 12 V supplies. However, very few drives actually use it.
The SAS is a new generation serial communication protocol for devices designed to allow for much higher speed data transfers and is compatible with SATA. SAS uses a mechanically identical data and power connector to standard 3.5-inch SATA1/SATA2 HDDs, and many server-oriented SAS RAID controllers are also capable of addressing SATA hard drives.
DevSlp or DevSleep (sometimes referred to as device sleep or SATA DEVSLP) is a feature in some SATA devices which allows them to go into a low power "device sleep" mode when sent the appropriate signal, which uses one or two orders of magnitude less power than a traditional idle (about 5 mW, [1] but some drives can get as low as 2.5 mW [2]).
The same style of connector, in single or paired 4-, 6-, or 8-pin configurations, may be used for additional CPU power and graphics card power. Power delivery to these devices has increased in successive generations of PC components, as their higher signal sophistication and speed requirements have raised their electrical demands.
In SATA 2.5 and above, the drive starts without spinup if the "disabled stagged spinup" (DSS) pin (standard power connector pin 11) is left floating. It only spins up when spoken to (physical layer initialization). [4] On connectors designed around older SATA revisions, the pin is connected to ground, disabling the feature.
Parallel ATA (PATA), originally AT Attachment, also known as Integrated Drive Electronics (IDE), is a standard interface designed for IBM PC-compatible computers.It was first developed by Western Digital and Compaq in 1986 for compatible hard drives and CD or DVD drives.