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Windows 7: Why does my Hard Drive Activity Light Constantly Blink

01 Mar 2010   #51

Win XP and 7

Quote   Quote: Originally Posted by Lordbob75 View Post
Quote   Quote: Originally Posted by Tgrds View Post
Quote   Quote: Originally Posted by Chuckles View Post
There is a service in both Vista and 7 that writes to two files lastalive0.dat and lastalive1.dat. This happens every second hence the flashing. It is like Window's heartbeat. What is it for? Perhaps it helps when things crash. Every time this is written, various logs are written to too. Years ago we said that Windows was the result of a programmer gone mad. Still true?
Yup I have the same problem with my hard drive light flashing with a low pulse every other second even will idling. I have also shut everything off I could think of and what I see left when using "Resource Monitor" is:


After searching across the web I have found some folks claiming that these little bad boys are somehow a part of the Task Scheduler, and that you can somehow turn something off there to get rid of these. Any thoughts?
If they are in the task scheduler, then you can manually go in and delete them. This should fix that.

Actually I found how to disable these in the registry:

TimeStampInterval is a registry key that defines how often the LastAlive info is written to the harddisk.

It is at HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Reliability\

By changing the registry value of TimeStampInterval to zero from one, you will stop the writes to the lastalive0.dat
and lastalive1.dat files on your harddisk.

I've done this on my machine and it does in fact seem to work well; however, my hard drive light is still blinking. Must be some other process.

My System SpecsSystem Spec
16 Feb 2011   #52

Windows 7 Ultimate 32bit

I know this is an old thread, but maybe some-one has finally found the answer.

The same problem has been annoying me for ages -- both on my desktop computer running 7 Ultimate and on several I've assembled for others.

As has been remarked, it's like a heartbeat.

It must be fixable on the system somewhere, for my Lenovo R500 laptop, running 7 Business (and it was an upgrade from Vista) doesn't do it.

When idle its HD light blinks only occasionally.
My System SpecsSystem Spec
10 Dec 2011   #53

Windows 7 Home Premium 64-bit
Old I know but still

For those still reading this old thread, I've pieced together that lastalive0.dat and lastalive1.dat are data files used by the Reliability Analysis component of the Event Log service to test the hard drive for the formulation of the System Stability Index. This index rates the computer's reliability on a scale of 1 (lowest) to 10 (highest) and has been in effect for the life of the computer.

Reliability Analysis Component

In addition to the aforementioned method of disabling this interesting, useless, and mostly unknown feature, you can disable the log by opening Event Log, going to the bottom "log summary" portion, scrolling down to Microsoft-Windows-Reliability-Analysis-Engine, going in to the log, and selecting "Disable Log" in the actions pane on the left.
Hope I helped somebody.
My System SpecsSystem Spec

11 Dec 2011   #54

Win XP and 7

FOUND IT...!!!

Go into Device Manager click on your "DVD/CD-Rom drives" and disable it. Bamm! no more heartbeat light flashing anymore. Problem is you have to go back in and re-enable it to use your DVD/CD-Rom drive.
My System SpecsSystem Spec
26 Jan 2012   #55

Windows 7
Samsung DVD-RW

I found it to be the Samsung SATA DVD-RW drive as well. blinking
My System SpecsSystem Spec
23 Apr 2012   #56

Win 7 Enterprise x64

Hi all,

I am experiencing the same blinking on my brand new company laptop, a Dell E6220. It came without a DVD/CD drive, so there is nothing to disable in the hardware manager.
I already posted in a different thread, it seems, that Windows is trying to create two files over and over again...

Constant hard drive activity?

Any ideas?

Thanks and cheers
My System SpecsSystem Spec

 Why does my Hard Drive Activity Light Constantly Blink

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