Samsung Green F2 extremely slow <1MB/sec

JesseJames_2

One of my hard drives (1.5TB F2) is extremely slow, have been trying to back up onto a external hdd, and getting speeds of 200 to 500KB/sec. This is not the system disc.
M/B is M2N32 SLI DeLuxe

The problem started all of a sudden last night, copying/moving very slow, and even deleting takes ages. No previous signs of degradation, SMART has always been enabled.

Chkdsk reports NO errors.
Disk management was showing "errors" last night but "reactivating" disk cleared that.
At the moment today it is showing no errors, but still as slow.
When loading up even before windows boots up it is taking a lot longer.

Is there anything I can try to test/fix this problem.

thanks

Lil306

Swap the SATA cable and hook it up to a different port ?

I don't know the specifics if those drives need any configuring, does you PC have the latest drivers and updates?

Here's a result from Google search, looks like this isn't uncommon
http://community.wdc.com/t5/Desktop/Caviar-Green-WD20EADS-00S2B0-Extremely-Slow-transfer-rates-Fix/td-p/6451

Here's a suggestion someone made....

If you can run Xperf, maybe that might help you out. I found an IRQ conflict between a sound card (IRQ 18) and the onboard Realtek NIC (IRQ 16). Yeah i know it doesn't make sense, but either removing the sound card or moving the sound card to a free PCI slot (which did change the IRQ assigned) got rid of the high CPU usage problem. It was actually cutting down my disk I/O speeds but about 75-85% every time the sound card was in use (to sound an alert in the datacenter and playing MP3s but the latter was strenously denied.) Xperf showed that when both the Multimedia and Ethernet controllers were enabled, the System Interrupt/DPC would spike CPU usage. This issue cropped up when I realised the servers with sound cards were always taking longer to do their daily SQL backups. The only clue at that point was the Windows Explorer process hitting 100% on a single CPU core. Ubuntu running on identical hardware was problem free, thank you M$.

I'm not saying this is your problem, but just to illustrate how something from out of left field could be causing you grief.

Additionally, try opening Performance monitor and measuring the disk, sometimes it's 100% on certain things could give you a better hint whats causing it

JesseJames_2

Thanks Lil306

EDIT: hdd was in fact a "Samsung Spinpoint F2 EcoGreen drive"

It appeared to be caused by my connecting a multimeter to my serial port just the day before (should have thought of that).
As soon as I took out the serial connection things started to work again.

However, it started to do the same again today, so not sure if it was just coincidence with the serial port. There is no CPU usage.
Have just tried a different sata port (as you suggested) and is working again, but am backing up just now.
After that will do a low level format.