Question about Western Digital Caviar WD2500JB Special Edition 250 GB Hard Drive

2 Answers

Slow write speed

I have a wd2500jb and a great problem for its write speed is only 0.48MB/s
while the read speed is 28.8MB/s, it installed as slave under windows xp pro
please tell me how to fix this problem. best regards

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  • siggma Oct 19, 2008

    I have a GA-945-GCMX-S2 motherboard with intel IC7 SATA / PATA mixed controller. It was advertised as a 3GB SATA controller. Now I suspect it's some kind of ATA converter. It shows my SATA drives as UDMA 5 which is clearly incorrect.

    Anyway, I have two WD2500JS (3GB) SATA drives connected. Under windows Vista (original or sp1) I get extremely slow data transfer between the two SATA drives but a third ATA WD200 copies at 35 to 65 mbps to and from either SATA drive. The ATA is an old WD200 that supports UDMA mode 5. In other machines it rarely exceeds 20mbps. I now use it as browser cache and swap since it's faster than the SATA.

    Both SATA drives pass WD diagnostics and a smart full self test passes on both drives. I don't think it's the drives but that's pure speculation.

    The issue is extremely slow transfer between the SATA drives. I've tried swapping cables, moving them to different ports and changing BIOS configuration but no difference. I've tried moving the drives from 0 to 1 and that does make a difference but ONLY AFTER I REFORMAT either drive. This is a real bugger of an issue. Copying files in Vista is sometimes 50mbps and other times it pokes along at 4mbps. If there's a pattern I haven't found it.

    Any ideas?

  • dmitry_bug Apr 13, 2009

    I also have the same problem. I have two wd2500ks and 2500js, their write speed >1MB/S but is shows normal write speed like ~50mb/s

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Had the same problem with my WD2500KS-00MJB0. It also has the (widely reported) defect where the thermal sensor is not reporting correctly (ie 40C when it's just been powered on, and should be reading approx 20C!).

My suspicion is that this line of WD2500KS models has a defective thermal sensor, and after a period of time the thermal sensor fails. When this happens, I suspect that the drive firmware tries to lower the temperature by reducing write speed.

My drive was out of warranty, so I used the 'Customer Loyalty Upgrade' discount on the WD Warranty Check site to get a new 500G drive. I still have the old drive, and some technical knowledge, so I'll see if there's a hardware hack to disable the thermal sensor.

Otherwise, go to the WD site's Warranty Check page, and get yourself a (heavily discounted) Customer Loyalty replacement.

Posted on Jul 13, 2009

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Hmmm..well...is that 250 Gigglebyte drive, as a slave, on a secondary port, by chance?

Posted on Mar 23, 2008

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