Fake WD 2T.B Hd in market
Hi,
i recently purchased 2tb wd green cov. hd, from well know online dealer, but to my surprise its fake, it was suppose to have 64mb sata-2,
but window shows its ata, and as from hd tune you can check its speed how its falling down, and no rpm info, no cache at all, its really shocked me very much, few friends told me that there are plenty of 2number hd in market now a days, my friend have 64mb cache 1tb orgnal its its rate going about 99mb/s
http://img859.imageshack.us/i/16484791.jpg
How to check its the orginal or fake?
Here are direct links to your images (no ads, banners, etc):
http://img859.imageshack.us/img859/7181/16484791.jpg
http://img21.imageshack.us/img21/7660/58313686.jpg
The read benchmark graph is a monotonically decreasing curve because there are more bits per track out the outer zones than at the inner zones. The usual ratio between max/min data rates is about 2:1.
Compare your HD Tune results against these:
http://uppix.net/d/c/4/f39377ddbd833c488795f2d057634.png
http://www.mygarage.ro/attachments/rezultate-teste/115758d1287161510-hd-tune-benchmark-wd20ears.jpg
http://img695.imageshack.us/img695/6577/hdtunebenchmarkwdcwd20e.png
http://www.playwares.com/xe/files/attach/images/756253/974/350/012/HDTune_Benchmark_WDC_WD20EARS-00S8B1_1.png
Your drive’s burst rate, 193.8 MB/s, reflects the data rate into and out of the drive’s cache. Since SATA-2 specifies an interface rate of 300MB/s (= 3 Gbps), and SATA-1 is 150MB/s, this tells us that the drive is operating at SATA-2 speeds. UDMA Mode 6 (Ultra ATA/133) is limited to 133 MB/s.
See http://en.wikipedia.org/wiki/Parallel_ATA
As for your cache question, the standard ATA Identify Device command only allows for reporting a maximum cache size of “32MB - 512 bytes.” This equates to a maximum value of 0xFFFF for word 21 in the ATA Identify Device data block. Therefore your drive reports 0.
Detecting Buffer or Cache Size in ATA Hard Disk Drives:
http://seagate.custkb.com/seagate/crm/selfservice/search.jsp?DocId=203631
Your RPM question is a good one, though. WD obfuscates its RPM specification by referring to it as IntelliPower. The drive actually reports 0 RPM. However, you can see the actual RPM in HD Tune’s access time graph. Notice that the width of data points is about 11msec. This corresponds to the time for one revolution at 5400RPM.
What disturbs me, however, is the large discontinuity at about the 550GB mark. This suggests to me that the drive is having difficulty reading beyond about the third zone. The separation in the data points appears to correspond to an additional revolution, suggesting that the drive is performing read retries. I’m wondering whether this is symptomatic of a miscalibrated head.
so how to check for head? any software etc?
Sorry, I’m not aware of any software to perform a head test on WD drives. BTW, I wouldn’t take my opinion as gospel. I’m not a data recovery professional.
