![]() Most connectors are rated for 9A per pin, but it would probably be safe to go up to 10-12A of current. * limitation of connector on the power supply in which the cable with connectors goes, if the power supply is modular. This is not an issue as each mechanical drive consumes less than 1A, which is well below 3A or 4.5A limit. * limitation of individual sata connectors : maximum 4.5A per voltage in each connector, though personally I wouldn't go above 3A on each voltage. You could in theory also program a small arduino or something to enable drives in sequence of your choice. Some WD drives also have that "third 3.3v pin in sata connector is stand-by" and some controllers can hold the drive in standby using that pin and release it in sequence to reduce current at startup. Some motherboards and some sata controllers have staggered spinup, where they turn on each drive in sequence, waiting a few seconds between each drive. You have 62A on 12v, so if that's the case your 24 drives would peak at 48A of current when you turn on the PC. the 5v current will not be significantly higher. So, reserve 1A for each SSD.Įdit: Yeah, the motor on mechanical drives will consume more current when it starts up, up to 2A or so on 12v. ![]() ![]() Reserving 0.75A of current on 5V for each mechanical drive, in theory you should be able to add up to 18 / 0.75 = 24 mechanical drives.Ī SSD consumes less power, around 1w when idle and reading files, but during long periods of writing some SSDs can consume up to 5-8 watts, and all this is from 5v - pretty much all SATA SSDs are 5v only. So assuming the motherboard and other things in your computer (usb devices, chipset, onboard sound, optical drive, whatever) needs around 4A of current on 5v (20w), this means you have at most 18 A of current on 5v. ![]() Your first limitation will be the maximum output current the power supply can provide on 5v, which in your case is : It will take up to 0.5-0.8A from 5v (~4w) and up to around 0.5A on 12v (6w) When this happens, the plastic between the lines is known to melt and catch on fire.A mechanical drive will consume around 8-10 watts, from 5v and 12v. In these adapters a lack of proper shielding can allow an electrical arc to jump between the black (ground) and either the 5.5V red or 12V yellow line. They’re inexpensive and they can use an existing Molex power connector to power any 2.5 SATA device.
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