Hey guys,
I have a Seagate ST3160318AS 7200.12 drive that has been giving me extremely low speeds(3-4MB/s). I am going to replace the drive as data is not an important criteria here. But I want to know if the power supply could be responsible for this If I connect a new HDD to a screwed power connection , the new HDD could also be ruined How to check if the power is alright?

Why do you think this is a power issue in the first place? Seems unlikely to me. You could probably test the PSU with a PSU tester: http://www.ebay.com/sch/i.html?_trksid= ... r&_sacat=0

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To me, when this question arises ("is the power supply ok?"), I just change the PSU.
Allow me to say that the PSU is probably the most important part of a machine and yes, it can completely ruin a hard drive before you even think "BOOM".

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Those PSU testers are useless. Break out a DVOM and check volatages under a load.

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need-help-diagnosing-issue-with-seagate-st3750330as-t15003.html#p99328

The one I have attached the pic is reliable up today, but only a complete diagnose with LOAD and meter (possibly oscilloscope to weed out filtering problems) can tell everything.
However , it can give a quick go-no go indication + test of the power good section.

Usually, when it comes to drive throughput, Power Supplies aren't a big issue. If it's not working, you'll know it, because you'll see a lot of system hangups and strange and random hard reboots.

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Everything else on the system is working fine.i guess there are several connectors that can power my hdd .how to identify them?

NOT TRUE.

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