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Can I safely power two hard drives (Western Digital VelociRaptor WD30000HLFS 10k RPM) from a single molex connection using a LP4 molex to 2 SATA splitter? The machine's power supply can easily handle the total power requirements of the rig, but I'm unsure of running two faster, 10k RPM drives off a splitter.

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Yes.

In the days when everyone wanted me to put neon lights everywhere, I used quite a few splitters. If you want to use a lot of splitters and extras, try to spread it around e.g. don't have an extension off an extension when there is another one just going straight to a optical drive. - put one on each.

But anyway, these sort of adapters are perfectly safe. I have even used Star tech ones as well. I had no idea they were an international company!

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In a word, yes. I'm using a 'DIY' MOLEX splitter for three SATA drives with no problems.

Based on this concept:

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Yes, it is safe. You should only worry when you begin to put Molex splitters into Molex splitters. I noticed that my 350W PSU couldn't start the PC with 20 HDDs.

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Is that sarcasm, or did you really attempt 20 HDDs? – Matt Hanson Sep 21 '09 at 23:09
Oh, the server does have 20 HDDs, though now it has two PSUs. The previous incarnation of said server had 27 HDDs (though total capasity after RAID was only 3.5TB). – Raynet Sep 22 '09 at 12:27
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