Constantly and intermittently accessing disk

[hexaae]

When I start the Temp monitor I see my HD led constantly and intermittently turning on like a periodic disk access every 1s.... As far I can remember I have no text output log enabled. When I close the temp monitor the issue disappears.
What can it be?

EDIT:
Oh! As often happens I've just found the culprit right after this post! Switching to Settings > Safety > IDE/ATA Drive scan Disable drive scan solved the problem but I have no drive info in main program.

Computer: MSI MS-16F1
CPU: Intel Core i7-840QM (Clarksfield SV, B1)
1866 MHz (14.00x133.3) @ 1197 MHz (9.00x133.0)
Motherboard: MSI MS-16F1
Chipset: Intel PM55 (IbexPeak-M)
Memory: 8192 MBytes @ 665 MHz, 8.0-8-8-23
- 4096 MB PC12800 DDR3 SDRAM - Kingston KHX1600C9S3/4GX
- 4096 MB PC12800 DDR3 SDRAM - Kingston KHX1600C9S3/4GX
Graphics: AMD Radeon HD 7970M [DELL]
ATI/AMD Radeon HD 7970M, 2048 MB GDDR5 SDRAM
Drive: ST750LX003-1AC154, 732.6 GB, Serial ATA 6Gb/s @ 3Gb/s
Drive: INTEL SSDSA2CT040G3, 39.1 GB, Serial ATA 3Gb/s @ 3Gb/s
Drive: PIONEER DVD-RW DVRTD10RS, DVD+R DL
Sound: Intel 5 Series/34x0 Chipset PCH - High Definition Audio Controller [B3]
Sound: ATI/AMD Verde/Heathrow/Chelsea - High Definition Audio Controller
Network: Intel WiFi Link 1000 BGN 1x2 HMC (MoW)
Network: RealTek Semiconductor RTL8168D/8111D PCI-E Gigabit Ethernet Adapter
OS: Microsoft Windows 7 Home Premium (x64) Build 7601

 

[Martin]

That flashing happens because HWiNFO monitors the health of disk drives as well.
If you want to avoid that, you don't need to disable the entire ATA Drive Scan, but just disable the S.M.A.R.T. sensors in the sensors window.

 

[hexaae]

Thanks, it works.
Please, could you add a button in the Sensors window to just close its own window and not Minimize All or Close and Save?