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hi, i just installed a second sata hd (western digital caviar se16 - 500 gb), and afterwards a low humming noise (that goes high from low constantly, regardless of whether computer's thinking or not) started to come from my computer. I opened it up, and the sound isn't actually coming from the HD, but rather somewhere near the PSU. I uninstalled the second HD, and the noise stopped. So i'm wondering whether my PSU is not powerful enough to operate 2 HDs? I know from the reviews WD Se16 500gb is supposed to be quiet...

my powersupply is Thermal Cooler ATX 12V, with max 350W (+12V, 10A; +5V, 14A; +3V, 14A). My first sata HD holds 160 gb (seagate barracuda 7200).

other stats :
motherboard : gigabyte tech co. 945PL-S3, bus clock 200 megahertz
processor : 3 gigahertz intel pentium D, 16 kilobyte primary memory cache, 1024 kilobyte secondary memory cache
graphic card : radeon x300 series

if someone could please advise me, i'd much appreciate it.

Most likely the processor or PSU... juded by your specs, 350W seems to be enough...

what would be the recommended processor and PSU for someone in my position?

Well the pentium D may not handle 1tb very well - its old with new. I guess it's the processor fan making a lot of noise, but I may be wrong

Go here - http://www.extreme.outervision.com/psucalculator.jsp and see how much power your pc needs, post your result here.

sorry, i went to that site, but i couldn't fill out all the sections because i don't know the exact specifics (i'm not familiar with all the technical names), ie. i know my ram is 1gb, but i don't know if it's a ddr2, ddr or pc66...i don't know the fan size (80mm-250mm...? other than the details i listed above, i don't know anymore about the fan), with the pci cards...i have no idea. sorry, i didn't build the computer myself, and i'm not as knowledgable with these things.

when the noise came around, i had all usb external devices turned off, and the computer was not running any applications or such.

Google and get everest home edition. That will tell you everything you will need to know about your pc.

Recommended PSU Wattage according to that site, is 271w.

what does this mean, that it's not my power supply??? i'm confused now to why the noise appears.

here are the specifics from the everest home edition :
DualCore Intel Pentium D 830 CPU 3.00GHz
Intel Lakeport-G i945G
1 GB DDR2-533 DDR2 SDRAM
Gigabyte GV-RX30S128D
RADEON X300 Series Secondary (256 MB)
ATI Radeon X300 (RV370) - accelerator

I suspect the noise is caused by a fan as fans are the most common source of noises. Can you discribe the sound in as much detail as possible. It is also possible for the components in the psu to make a noise too.
A good accurate discription of the noise may well help me to figure out what the cause is.

right now, i have only one HD installed, and there are no noise from anywhere. normal sound. very quiet.


when i have both HD installed, i hear an almost vibrating low/deep humming noise that goes high and low within seconds. so it's like...HUMMM...humm...HUMMM...humm... and it feels like something is vibrating, but the machine isn't vibrating (nothign is moving). if i put my ear close to the fans...it sounds ok. but the humming noise is around the psu and the fan, yet i can't pin point exactly...it's quite hard because the noise just travels everywhere. i know the humming isn't coming from the second HD. All i know for certain is that the noise stops when only one hd is operating....

i cleaned out the fan + power supply (the dusts and everything), made sure everything is secure and tight, no loose ends....but annoying sound persists. it's not very loud, you can't hear it from another room, but when you're on teh computer, you can feel it. it doesn't ahve the normal computer sound (that i have when only 1 hd is running).

Ok, pretty sure i know what the cause is now. I think its a resonant vibration of the case itself. Do you have enough space to put a gap between the hdd's? Another thing that could help is to make sure the hdd mounting cage is securely fixed.

Let me know if that helps.

I never knew HDD's had fans though...

Hdd's dont have fans! They have metal disks within them that spin. Hence they are labeled as 5,400rpm, 7,200rpm, etc..

ok, i rearranged the HDs couple of times, moved them around from slot to slot to see if that made any chages, but the hummings still there. I checked everything is secure, and they are....

from the everest report, it even said the temperatures are low - Motherboard 34 °C (93 °F)
CPU 1 °C (34 °F)
Seagate ST3160811AS 42 °C (108 °F)
WDC WD5000AAKS-65YGA0 35 °C (95 °F)

Place your hand against a solid part of the case and see if you can feel the vibration then.

Yes, i feel the vibration when i put my hand against the side of the computer case.

Are the parts of the case screwed or riveted together?

screwed together. but i checked all the screws and it seems fastened...

You may need something between the contact points between the hard drive cage and the case then. Even bits of cardboard should do the job.
I remember a guy in australia had a similar problem about a year and a half ago here on TS and i suggested cardboard to dull the noise and it worked well.

you mean stick cardboard (like box quality) on both sides of the case (inside) near the HD, just one side, or everywhere inside (that would block ventilation)?