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Old January 7, 2010, 10:17 AM
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Originally Posted by CMetaphor View Post
Good point. But then again... unless im just too tired to understand phyics today. Wouldnt a single platter 3.5'' hard drive's outer edge spin faster at its outer edge running at 7200rpm than a 2.5''s outer edge running at 10k rpm? Perhaps my "lil fast and easy brain math" is off today.
it's what I never understand too , but I think even the 3,5 raptor , have a small disk inside no ? , I have 3,5 " 15K cheetah on my server, don't know the size of the disk too
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Old January 7, 2010, 10:19 AM
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I will get a coffee too, before someone compute the speed in./sec of the outside of the plater
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Old January 7, 2010, 10:22 AM
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Things spin faster on the outside of the disk, of course. HOWEVER, access times go through the roof when the arm has to move more across the disk. My guess is that they kept the RPM the same, but minimized access times by making the platters smaller. Therefore there were higher IOPS and sequential speeds on the Velociraptor due to lower access times than the original Raptors.
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Old January 7, 2010, 10:24 AM
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Things spin faster on the outside of the disk, of course. HOWEVER, access times go through the roof when the arm has to move more across the disk. My guess is that they kept the RPM the same, but minimized access times by making the platters smaller. Therefore there were higher IOPS and sequential speeds due to lower access times than the original Raptors.
Which is why i said a 500gb platter x2, with dual procs and short stroking would be cool to see, lol.
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Old January 7, 2010, 10:27 AM
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That 15K Cheeta is a SAS drive though, as far as I'm aware that is the only flavour they came in.

This is a SATA Drive and I look forward to it.

ST
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Old January 7, 2010, 10:27 AM
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TBH I wouldn't be surprised if the random access speed also goes down...and they add in the sweet dual actuator tech we first got intro'ed to with the 2TB black. Dual proc, 64mb cache, dual actuator is my guess for the goodies onboard :)
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Old January 7, 2010, 10:29 AM
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Quote:
Originally Posted by CMetaphor View Post
Good point. But then again... unless im just too tired to understand phyics today. Wouldnt a single platter 3.5'' hard drive's outer edge spin faster at its outer edge running at 7200rpm than a 2.5''s outer edge running at 10k rpm? Perhaps my "lil fast and easy brain math" is off today.

the 300gb aerial density doesn't win it for the vraptor actually... dammit, math time:
Area of a 2.5'' disk would be Pi x 2.5''/2 = 3.92 inches cubed (not including the unuseable space in the very center)
Area of a 3.5'' disk would be = 5.497 inches cubed.

If the aerial density of the 2.5 is 300gb, then its managing approximately 76.53 gigs per cubic inch.
For the 3.5 @ 500gb aerial denisty, it would be 90.95 gigs per cubic inch

therefore, the 3.5'' disk with 500gb aerial density still has a marked advantage. I wonder if the faster RPM of the vraptor will make up for it?

PS: anyone can correct me on my math if im wrong - i dont like math. lol

my head just blew up
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Old January 7, 2010, 10:29 AM
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Quote:
Originally Posted by AkG View Post
TBH I wouldn't be surprised if the random access speed also goes down...and they add in the sweet dual actuator tech we first got intro'ed to with the 2TB black. Dual proc, 64mb cache, dual actuator is my guess for the goodies onboard :)
This. I think you're right on the money . But to clarify, dual actuator needs dual proc, correct? Otherwise there would be a mix up in IO?
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Old January 7, 2010, 10:30 AM
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Quote:
Originally Posted by mattlef View Post
my head just blew up
dont worry about it, i was off. Area is (pi*r) SQAURED, lol. Yeah, im tired today. Check bojangles' post
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Old January 7, 2010, 10:35 AM
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Quote:
Originally Posted by MarkOne View Post
I will get a coffee too, before someone compute the speed in./sec of the outside of the plater
2.5 * pi = 7.85 @ 10K = 78500 in/sec
3.5 * pi = 10.99 @ 7.2K = 79128 in/sec
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