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  1.    25 Oct 2015 #31
    Join Date : Oct 2014
    Posts : 920
    Windows 10 Pro

    6Gbps is the theoretical speed of the interface. Doesn't mean it will actually transfer that fast. A mechanical drive certainly will NOT.

    That is 572MB/sec I believe. Fastest mechanical drive comes in around 1/3 of that. Around 190MB/SEC.
      My ComputerSystem Spec
  2.    26 Oct 2015 #32
    Join Date : Dec 2014
    Posts : 437
    Windows 10 Pro x64

    Quote Originally Posted by OldMike65 View Post
    I was not joking...read their spec's yourself....
    Then you ought to read them carefully. Look at their sustained transfer rates. The only reason SATA3 (not SATA 6) hard drives are slightly faster is because they are higher in areal density than the SATA2 in general, so give you slightly better sustained rates.
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  3.    26 Oct 2015 #33
    Join Date : Dec 2014
    Posts : 437
    Windows 10 Pro x64

    Quote Originally Posted by OldMike65 View Post
    If you READ their spec's their the SAME speed as WD Blue drives. Only because their both designed for SATA 3 which makes both drives operate at 6GB/s no difference in speed.
    The drives DO NOT transfer at 6 Gbits/s (= 600 MB/s = 550 MB/s top in practice). That is the maximum link speed that SATA3 can handle. Hard drives can only do about 180 MB/s tops (at the outer edge of their platters) because they are physically limited by their rpm (7200) and track density. SSD on the other hand can transfer at the full 550 MB/s because they don't have these limitations.

    You are looking at the wrong numbers in the HDD specs. Look at the sustained data rate, if the manufacturer provides it. That is around 160 to 180 MB/s.
      My ComputerSystem Spec
  4.    26 Oct 2015 #34
    Join Date : Aug 2015
    Maine
    Posts : 40,109
    Windows10Pro 64Bit

    Quote Originally Posted by Geneo View Post
    The drives DO NOT transfer at 6 Gbits/s (= 600 MB/s = 550 MB/s top in practice). That is the maximum link speed that SATA3 can handle. Hard drives can only do about 180 MB/s tops (at the outer edge of their platters) because they are physically limited by their rpm (7200) and track density. SSD on the other hand can transfer at the full 550 MB/s because they don't have these limitations.

    You are looking at the wrong numbers in the HDD specs. Look at the sustained data rate, if the manufacturer provides it. That is around 160 to 180 MB/s.
    You are correct Geneo, on those spec's. Also read where the WD Blue only uses a single platter, where the Black uses around 6 to 8, platters with a 5 year warranty, where the Blue is 3 year warranty. But the Blue at 7200rpm and with Sata3 would be faster than the WD Black because of only using 1 platter. Bottom line thou is the sustained data rate would be around 154 to 160MB/s avg.
    The WD drives I am only talking about here are the 1TB models, not talking about anything bigger. Because WD does make some Blue drives that are only 5400rpm's which are even slower. So These are pretty good drives for the price, and with a SSD drive as the main drive (OS installed) would make a good setup.
    I will admit you made me check and read more info on these drives, and that's when I found out about their sustained data rates.
    Thanks for giving me the right info, and taking the time to post this info too!!! Much appreciated GENEO !!!!
      My ComputersSystem Spec
  5.    26 Oct 2015 #35
    Join Date : Aug 2015
    Penn's Woods
    Posts : 1,287
    Windows 10 Home

    Quote Originally Posted by pparks1 View Post
    6Gbps is the theoretical speed of the interface. Doesn't mean it will actually transfer that fast. A mechanical drive certainly will NOT.

    That is 572MB/sec I believe. Fastest mechanical drive comes in around 1/3 of that. Around 190MB/SEC.
    As far as theoretical, that would be: 6,000,000,000/8/1024/1024 = 715 MB/s.
      My ComputerSystem Spec
  6.    26 Oct 2015 #36
    Join Date : Dec 2014
    Posts : 437
    Windows 10 Pro x64

    Quote Originally Posted by OldMike65 View Post
    You are correct Geneo, on those spec's. Also read where the WD Blue only uses a single platter, where the Black uses around 6 to 8, platters with a 5 year warranty, where the Blue is 3 year warranty. But the Blue at 7200rpm and with Sata3 would be faster than the WD Black because of only using 1 platter. Bottom line thou is the sustained data rate would be around 154 to 160MB/s avg.
    The WD drives I am only talking about here are the 1TB models, not talking about anything bigger. Because WD does make some Blue drives that are only 5400rpm's which are even slower. So These are pretty good drives for the price, and with a SSD drive as the main drive (OS installed) would make a good setup.
    I will admit you made me check and read more info on these drives, and that's when I found out about their sustained data rates.
    Thanks for giving me the right info, and taking the time to post this info too!!! Much appreciated GENEO !!!!

    That is why I have SSDs and Blue 1TB drives
      My ComputerSystem Spec
  7.    26 Oct 2015 #37
    Join Date : Dec 2014
    Posts : 437
    Windows 10 Pro x64

    Quote Originally Posted by Word Man View Post
    As far as theoretical, that would be: 6,000,000,000/8/1024/1024 = 715 MB/s.

    SATA3 uses 8b/10b encoding and is 6 x 10^9 bits/s, which means for every 8 bits (byte) payload there are two bits overhead, so instead of dividing by 8 you divide by 10. That gives you a theoretical bandwidth of 600 MB/s.

    You are dividing by 1024/1024 which would give you MiB/s. Nobody uses those units for transfer speeds, they use MB/s.
      My ComputerSystem Spec
  8.    26 Oct 2015 #38
    Join Date : Oct 2014
    Posts : 920
    Windows 10 Pro

    And I included typical overhead which drops max down to around 572
      My ComputerSystem Spec
  9.    26 Oct 2015 #39
    Join Date : Sep 2014
    Posts : 91
    64-bit 10240 10 Pro
    Thread Starter

    Quote Originally Posted by OldMike65 View Post
    You are correct Geneo, on those spec's. Also read where the WD Blue only uses a single platter, where the Black uses around 6 to 8, platters with a 5 year warranty, where the Blue is 3 year warranty. But the Blue at 7200rpm and with Sata3 would be faster than the WD Black because of only using 1 platter. Bottom line thou is the sustained data rate would be around 154 to 160MB/s avg.
    The WD drives I am only talking about here are the 1TB models, not talking about anything bigger. Because WD does make some Blue drives that are only 5400rpm's which are even slower. So These are pretty good drives for the price, and with a SSD drive as the main drive (OS installed) would make a good setup.
    I will admit you made me check and read more info on these drives, and that's when I found out about their sustained data rates.
    Thanks for giving me the right info, and taking the time to post this info too!!! Much appreciated GENEO !!!!
    A 3 year warranty vs a 5 year warranty . I would go for the Black. I took apart a bad Blue WD and it had more than one platter. I would go with the Black, but that is me YMMV..
      My ComputerSystem Spec
  10.    26 Oct 2015 #40
    Join Date : Aug 2015
    Maine
    Posts : 40,109
    Windows10Pro 64Bit

    Quote Originally Posted by Gary View Post
    A 3 year warranty vs a 5 year warranty . I would go for the Black. I took apart a bad Blue WD and it had more than one platter. I would go with the Black, but that is me YMMV..
    I was only talking about the Blue 1GB 7200rpm model, that is fairly new model. I got those spec's from 3 different places, including WD. That do make a lot more different models of the Blue and Black.
      My ComputersSystem Spec

 
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