Solved HDD read speed insanely slow

August 21, 2011 at 18:42:21
Specs: Windows 7
Hi all. I'm new here. To the point:
I have WDC WD20EADS-00S2B0 about a year or so. After a quick crash one night (a mere milisecond blackout, my computer restarted on its own) and the disk began to developed bad sector. Took me days to scan the whole drive, found many bad sectors. (I know its freaking stupid not to have UPS these days).
Last time i scan was about two-three weeks ago, I ended it up when the blackout strike again (68% completing on data sectors). The blackout took about 3-4 hours so i completely remove the disk from my system.
Since the first blackout, i have insanely slow read speed on this disk. I have to wait around 1-2 minutes just to open a folder. Every partition behave the same (1 primary, 2 on extended). Copying files without opening the folder would take average 4K-1.5MB/s (on win7) for ANY filesize (the smaller the files; ie:html, the longer it takes). But the weird thing is, if i leave it a while inside the folder before i copy the files (open the folder content), the transfer rate could hit 10-30MB/s. Long time waiting also happened at boot (took 1-2 minutes wait before login screen).

My question is the drive starting to die or is there any way i could use to fix the problem?

PS: I still need the data (my movies and mp3 files reside on the disk and theres no backup yet). i'm doing backup but it hits my nerve with that slow rate.

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August 21, 2011 at 21:14:19
✔ Best Answer
This issue was recently explained in another thread. HDDs contain a "pool" of extra sectors. When a sector goes bad, it is replaced with a good one from the pool. This happens automatically without producing any problems or error messages. When the pool of extra sectors is depleted, that's when problems begin. It appears you pool is empty - it's time to replace the drive.

Did you try scanning it with the WDC diagnostic software, Data LifeGuard?

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August 22, 2011 at 08:35:22
Earlier today, I stumble upon a bad sector when copying files and the disk stall to the point where i lost my patience and hit the reset button. Since then windows kept asking me to do scandisk, something i dont wanna do ever again after wasting 3 days scan on a blackout.
I downloaded Data Lifeguard about an hour ago just before i read this thread. I m running test on my backup disk (older, 1TB) which only have minor problem (sometimes recognized in bios, sometimes dont). Judging by the performance (approximately 2.5 hours extended test in 1 TB disk) i'll do it later on the 2TB.

I'm aware about the "pool", but i didnt thought that it could be the source of my problem. Thanks for your explanation, mickliq.

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