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Windows 7: Storage question

21 Apr 2013   #11
kbrady1979

Windows 7 Professional 64bit SP1
 
 

For the money, the Seagate 1TB-3TB Barracuda drives are phenomenal. I have 2-2TB drives and they are rock solid.


My System SpecsSystem Spec
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21 Apr 2013   #12
Britton30
Microsoft MVP

Windows 7 Ultimate X64 SP1
 
 

Quote   Quote: Originally Posted by whs View Post
Quote   Quote: Originally Posted by Britton30 View Post
All 7200RPM-ers will have about 417 micro-second access times.
Gary are you sure with this number. Mine show an access time of 15ms on average. Example: a 7200RPM Seagate
I was way off. I was referring to Average Rotational Latency and not access time and the figure I quoted should be 4.17ms instead. Sorry for the confusion.
https://en.wikipedia.org/wiki/Hard_d...tional_latency

My 500GB Seagate Constellation.
Storage question-21-april-2013_08-51.png


My System SpecsSystem Spec
21 Apr 2013   #13
kbrady1979

Windows 7 Professional 64bit SP1
 
 

For what it's worth, here are the numbers for the new Seagate Barracuda's. 2TB, 7200.14. Neither have an OS on them, one has User Data and all sorts of files stored on it, the other only has video files.......which is why, I suspect, the difference in the graphs. All in all, great drives for storage!

Storage question-hd-tune-test-2.jpgStorage question-hd-tune-test-1.jpg


My System SpecsSystem Spec
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21 Apr 2013   #14
whs
Microsoft MVP

Vista, Windows7, Mint Mate, Zorin, Windows 8
 
 

Quote   Quote: Originally Posted by Britton30 View Post
Quote   Quote: Originally Posted by whs View Post
Quote   Quote: Originally Posted by Britton30 View Post
All 7200RPM-ers will have about 417 micro-second access times.
Gary are you sure with this number. Mine show an access time of 15ms on average. Example: a 7200RPM Seagate
I was way off. I was referring to Average Rotational Latency and not access time and the figure I quoted should be 4.17ms instead. Sorry for the confusion.
https://en.wikipedia.org/wiki/Hard_d...tional_latency

My 500GB Seagate Constellation.
Attachment 264968
Thanks for clarifying. But even the 4.17ms I have never seen. It is always around 15ms. The nums that kbrady1979 shows are also like this.
My System SpecsSystem Spec
21 Apr 2013   #15
kbrady1979

Windows 7 Professional 64bit SP1
 
 

I think the Average Latency of either 4.16/4.17ms was just a advertised number that some manufacturers used. It looks to be how long it takes to actually get the sector under the head, and that would depend more on spindle speed than anything. For storage, the Read/Write speeds are actually just as important(if not more so) than latency or seek time.
My System SpecsSystem Spec
21 Apr 2013   #16
whs
Microsoft MVP

Vista, Windows7, Mint Mate, Zorin, Windows 8
 
 

Quote:
For storage, the Read/Write speeds are actually just as important(if not more so) than latency or seek time.
Agreed for sequential R/W. But for random, the R/W speed is of lesser importance. That's where the SSDs come in because their access time is appr. 150 times faster than on HDDs. Their R/W speeds are only a bit faster.
My System SpecsSystem Spec
21 Apr 2013   #17
kbrady1979

Windows 7 Professional 64bit SP1
 
 

Quote   Quote: Originally Posted by whs View Post
Quote:
For storage, the Read/Write speeds are actually just as important(if not more so) than latency or seek time.
Agreed for sequential R/W. But for random, the R/W speed is of lesser importance. That's where the SSDs come in because their access time is appr. 150 times faster than on HDDs. Their R/W speeds are only a bit faster.
Yep
My System SpecsSystem Spec
21 Apr 2013   #18
Britton30
Microsoft MVP

Windows 7 Ultimate X64 SP1
 
 

Yeah, latency is a mathematical number. It's the average time a bit of data will be from the heads, which is 180 degrees away.
My System SpecsSystem Spec
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