Question about Seagate 400GB 7200rpm External HDD Retail p/n ST3400801CB-RK (ST3400801CBRKX) Hard Drive

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Power supply for Seagate 400GB

Hi I am looking to purchase a powers upply with cable for my Seagate 400GB HD.Part Number 9Y784L-561 and serial Number 4NF23CS1.

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Re: power supply for Seagate 400GB

Ebay or may be a solution.
I've used those Seagate portables and 2 have caused problems.
Or disassemble the unit, remove the drive and buy a portable case or USB adapter.

Posted on Oct 16, 2007

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What is the proper power supply for a seagate 9zc2a8-500

Looks like the adapter supplies 12volts at 2 or even 3 amps.

Oct 17, 2014 | Hard Drives

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I have connected all the necessary cables to the hdd, yet when i switch on the PC, nothing appears, there's nothing on display....

Hi, looks like u have a hardware probs! Check the memory card and power supply, the bios should start first upon starting and check ur HD in the bios set up!
Do that and tell wut happened!

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Seagate 400gb hdd st3400833as lc gets on powering up

it might be a bad drive also examine it and see if the are any bent connection pins if it not sata

May 08, 2010 | Hard Drives

1 Answer

Please i need the power adapter rating for seagate

Have you got the original power adapter?
If so the voltage details are printed on the label on the bottom of the adapter.
If the external USB Seagate hard drive houses a 31/2" drive then it requires an power adapter that provides +12 volts and +5 volts both supplying approx 2000mA of current.
If the Seagate uses a 21/2" (laptop) hard drive then it only requires +5 volts power adapter.
The only problem is the power connector to the external drive, make sure it suits the external hard drive unit and the power pins are correctly wired for the Seagate. If the polarity of the plug is incorrect lt wired (ie reverse polarity) then it could damage the USB hard drive and adapter case.

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I can't find my adaptor/power supply cable. can

Most are 12V for the FreeAgent drives, like the power inside your pc.

Oct 12, 2009 | Seagate FreeAgent Pro - 500GB, 7200 RPM,...

1 Answer

Lost power supply for Model#ST3400801CB-RK

The power supply for this drive is not ordinary. This means it has two pairs: 5.0V (1.5 A) and 12V (1.5 A) of power pins
Connector is S-Video like type

Feb 13, 2009 | Seagate 400GB 7200rpm External HDD Retail...

1 Answer

Lost power supply

I think you might find this link most useful, from the Seagate Community Forums.

In short, others have had great difficulty buying Maxtor replacement power adapters, however you can buy a generic 12V, 3A DC power supply for $15-20 from a number of sources. Confirm your actual power requirements by referring to the product label on the drive itself.

Hope it helps,

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New Seagate FreeAgentPro USB eSATA 500GB power on light not glows

Thank you for your reply.

I have solved the problem with local help.

Printed installation manual of Seagate 500 GB eSATA external hard drive has not properly mentioned how to use power on/off switch once connected to mains. I could get local help, who has already used the device. On/Off switch to be pressed for few seconds after mains connected, sometimes it comes automatically once power is on and USB cable pluged to the USB port of PC if power supply is ok. There is no indicator for the power supply (before device glows) after connected to the mains. I was in confusion whether power supply is ok or not.

Finally, It was found that the problem was with mains power supply and I have changed the power socket and adapter.

SP Jena

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Harddrive not readable by my computer.

well you could buy a hard drive enclsure (usb) then open up the seagate and take out the hd (unplug it form the ribbon cables) then plug it into the enclosuer and try plugging that in. may or maynot work becouse the hd itself may be "fried"

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1 Answer

Tryi8ng to install portable 120GB hard drive (seagate)

If your USB ports do not supply enough power (older computers) then the drive may fail to show up in My Computer.
The Seagate should have a special Y cable. There are two USB connectors on one end that must both plug into your computer - one for data and power - the other for power only. The other end of the cable has the mini USB which plugs into the Seagate.

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