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12 HDD's take how much PSU ??

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February 6, 2012 11:36:38 PM

Anyone know how much power it takes for a HDD ?

I read that green drives take about 20 watts and standard drives can take 35 watts.

I am running SSD and velociraptors in my main rig- but I want to build a new storage server with WD black drives 2TB x 20 for storage.

Any idea how much power that really would need?

More about : hdd psu

a b ) Power supply
February 7, 2012 1:29:42 AM

2TB Western Digital Caviar Black (WD2001FASS) Specifications:

Transfer Rates: (Serial ATA): 3 Gb/s (Max)
User Sectors Per Drive: 3,907,029,168
Physical Dimensions: 1.03 x 5.79 x 4.00"
Operating Shock (Read): 30G, 2 ms
Non-operating Shock: 300G, 2 ms
(Acoustics) Idle Mode: 29 dBA (average)
(Acoustics) Seek Mode 0: 34 dBA (average)
(Acoustics) Seek Mode 3: 30 dBA (average)
Temperature (English)
Operating: 32° F to 140° F
Non-operating -40° F to 158° F

Power Dissipation
Read/Write: 10.70 Watts
Idle: 8.20 Watts
Standby: 1.30 Watts
Sleep: 1.30 Watts
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a c 1167 ) Power supply
a b G Storage
February 7, 2012 1:36:42 AM

Try finding a power supply with twenty SATA power connectors on it.

You also need to take into consideration the total start-up current from the +12V and +5V rails when all of the drives start to spin up when the power to the drives is first turned on and you don't have any control over allowing a staggered start-up of each HDD.

2TB Western Digital Caviar Black (WD2001FASS)
Startup Current +12V: 1.16 Amps
Startup Current +5V: 0.60 Amps
Read/Write: 10.70 Watts
Idle: 8.20 Watts
Standby: 1.30 Watts
Sleep: 1.30 Watts

With twenty of these HDDs you can expect a start-up current draw from the +12V rail(s) to be at least 23.2 Amps or greater and from the +5V rail to be 12 Amps or greater.

The power supply needs to be robust enough to handle this inrush current on those rails.
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Related resources
a b ) Power supply
a c 812 G Storage
February 7, 2012 2:01:04 AM

Your bios may have an option to stagger HDD spin-up to save on needing so much extra power just to start your motors.
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February 7, 2012 5:01:42 PM

ko888 said:
Try finding a power supply with twenty SATA power connectors on it.

You also need to take into consideration the total start-up current from the +12V and +5V rails when all of the drives start to spin up when the power to the drives is first turned on and you don't have any control over allowing a staggered start-up of each HDD.

2TB Western Digital Caviar Black (WD2001FASS)
Startup Current +12V: 1.16 Amps
Startup Current +5V: 0.60 Amps
Read/Write: 10.70 Watts
Idle: 8.20 Watts
Standby: 1.30 Watts
Sleep: 1.30 Watts

With twenty of these HDDs you can expect a start-up current draw from the +12V rail(s) to be at least 23.2 Amps or greater and from the +5V rail to be 12 Amps or greater.

The power supply needs to be robust enough to handle this inrush current on those rails.


Awesome Thanks !

I might just add a second PSU.

I have a 1200watt now. My case has enough room for it .

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a b ) Power supply
a c 82 G Storage
February 7, 2012 5:26:35 PM

You don't need an additional PSU to power up 20 hard disks.
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