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BIOS only detect one of my two HDD's

post #1 of 14
Thread Starter 
Hi all,

I recently bought an extra HDD. It's exactly the same as the one that I have right now (I want to use them in RAID).
However, when I plug the new HDD into my computer, the BIOS only recognizes the new one. As soon as I pull it out, it recognizes the other one again.
How is this possible and does anyone know a solution?
Specs are in my signature.

Thanks!
xIntenso
post #2 of 14
The drives are the same model? How do you know the BIOS is recognizing the new one and not the old one?
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post #3 of 14
Thread Starter 
Quote:
Originally Posted by error10;12960379 
The drives are the same model? How do you know the BIOS is recognizing the new one and not the old one?
Yes. They are both Samsung HD753LJ's.
I know because the old one still contains my OS and therefore can boot into windows.
The new one is empty and therefore cannot boot.
post #4 of 14
Thread Starter 
Has anyone got an idea of what could be going on?
post #5 of 14
Press F12 at boot and choose which drive you want to start up from. Other than that, I can't think of anything.

Unless you are, for some reason, plugging your new harddrive's SATA cable into your old one's former one. In which case, don't.

If they are IDE drives, you need to set your new one to a slave drive by shorting the correct jumpers shown in your manual.
Edited by OverTheBelow - 4/2/11 at 11:24am
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post #6 of 14
Thread Starter 
Quote:
Originally Posted by OverTheBelow;12973344 
Press F12 at boot and choose which drive you want to start up from. Other than that, I can't think of anything.

Unless you are, for some reason, plugging your new harddrive's SATA cable into your old one's former one. In which case, don't.

If they are IDE drives, you need to set your new one to a slave drive by shorting the correct jumpers shown in your manual.
That didn't work. The post screen at startup and the BIOS alwasy show only one of the two HDD's.

I'm not plugging the new cable in the old one's former port. I'm putting it in a previously unused port.

Also, the drive is SATA so it can't be master/slave problems.

Anyone else got any suggestions?
post #7 of 14
First, plug in only one drive at a time. Make sure you use the same cables and port as the previous drive, so that you can be sure that it really is an issue with the drive and not some other piece of your system.
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post #8 of 14
Thread Starter 
Quote:
Originally Posted by error10;12974091 
First, plug in only one drive at a time. Make sure you use the same cables and port as the previous drive, so that you can be sure that it really is an issue with the drive and not some other piece of your system.
I tried every possbile combination and came to the following conclusion:
As soon as I plug the power into the new drive, the old one doesn't get any power anymore. It could certainly be a possibility because I have a cheap PSU and all of the SATA power cables are on one wire. So I bought a 4-pin molex to SATA power adaptor (All of my molex connectors are on a different wire and still unused). And guess what? It now worked immediately!

Thanks a lot!
Rep+ to both of you.

I just wonder why the old one doesn't get any power when I plug in the new one. Could it be because it's connector is the last one of the four?
Anyone know what could be going on?
post #9 of 14
nvm you solved it
post #10 of 14
Sounds like your PSU isn't providing enough power on that rail to supply all of the hard drives that it is physically possible to connect to it, which is utterly silly. It's either a design flaw or something in your PSU has failed; either way, RMA the PSU. (If something HAS failed in the PSU, then something else is likely to fail soon.)
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