I've heard that most drives (Seagate and Samsung included) park their heads on-platter (over the edge, where there's no data) while WD drives park their heads off-platter.
This could be the noise you're hearing - the head might literally be moving 2-3x farther, off the platter, making an odd swishing noise before it powers down.
If none of the drives have failed, I would say it's normal and not anything to be worried about. It might even be a safety feature (off-platter head parking) that increases reliability and shock resistance. (Can't damage the head/platter easily while in transport.)
If you're hearing the sound a lot, you should check your power options in the control panel to make sure hard drive spindown is off. You may also want to grab HDTune or Defraggler and check the SMART info of your drives - if they have a high amount of LCC (Load Cycle Count), then they are parking their heads a lot, which supports my hypothesis.
| CPU | Motherboard | Graphics | RAM |
|---|
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| Hard Drive | Hard Drive | Hard Drive | Hard Drive |
|---|
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| CPU | Motherboard | Graphics | RAM |
|---|
| Phenom II X6 1055T | Saberooth 990FX | eVGA GTX 560 SE | 4x4GB Corsair Vengeance 1600mhz |
| Hard Drive | Hard Drive | Hard Drive | Hard Drive |
|---|
| Seagate 3TB 7200.14 - ST3000DM001-9YN166 | WD Black 640GB - WD6401AALS | WD Green 1.5TB - WD15EARS | Hitachi 2TB 7200RPM - HDS723020BLA642 |
| Hard Drive | Hard Drive | Hard Drive | Hard Drive |
|---|
| WD 2TB Green - WD20EARX | WD 2TB Green - WD20EARS | WD Blue 500GB - WD5000AAKS-00V6A0 | WD Scorpio Black 500GB - WD5000BEKT-00KA9 |
| Optical Drive | Optical Drive | Optical Drive | Cooling |
|---|
| Pioneer DVR-115DBK | Samsung SH-S243D/BEBE | LG GH22NS90 | Coolit Eco R120 |
| Cooling | Cooling | OS | OS |
|---|
| Yate Loon Fans - D12SL-12-RED/BLACK | Fractal Design 120mm Fan - FD-FAN-120 | Windows 7 | Ubuntu 10.04 LTS |
| Monitor | Keyboard | Power | Case |
|---|
| Samsung 2343BWX 23" (2048x1152) | I-Rocks KR-6170-BK | Corsair HX620 | Fractal Design Define R3 |
| Mouse | Mouse Pad | Audio | Audio |
|---|
| Razer Abyssus 3500DPI | Mousepad + Desk | Onboard Realtek® ALC 892 | Cyber Acoustics CA-2992 2.0 Speakers |
| Other | Other | Other |
|---|
| Razer Krait 1600 DPI | nGear G-C1601 Card Reader | Pisen Card Reader |
| View all |
| CPU | Motherboard | Graphics | RAM |
|---|
| VIA Eden C7 1200mhz | Jetway J7F4K1G2ES-LF | VIA Onboard | 512MB PC2-4200 |
| Hard Drive | Optical Drive | Cooling | OS |
|---|
| A-Data FlashDrive | None | Fanless | Linux |
| Monitor | Keyboard | Power | Case |
|---|
| Headless | None | 65w Power Brick | Antec ISK300-65 |
| Mouse | Audio |
|---|
| None | Onboard VIA |
| View all |
| CPU | Motherboard | Graphics | RAM |
|---|
| Barton XP-M 2400+ FJQ4C | Asus A7N8X-E Deluxe | 256MB BFG 7800GS OC | 2x512MB Samsung PC3200 |
| Hard Drive | OS | Monitor | Keyboard |
|---|
| Raptor 74GB/Seagate 120GB | Windows 2000 Pro | 60hz 17" CRT | Brandless PS2 Keyboard |
| Power | Mouse |
|---|
| Antec Neo HE 550w | Logitech G5 |
| View all |
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