Seagate Claims 2.5" SCSI Drive is World's Fastest 218
theraindog writes "Seagate has announced a 2.5" SCSI hard drive that spins at an astounding 15,000RPM. The Savvio 15K is the first 2.5" hard drive with a 15K-RPM spindle speed, but what's more interesting is that Seagate claims it's the fastest hard drive on the market. Indeed, the drive boasts an impressive 2.9ms seek time, which is more than half a millisecond quicker than that of comparable 3.5" SCSI drives. The Savvio 15K also features perpendicular recording technology and a claimed Mean Time Between Failures of 1.6 million hours."
laptop use? (Score:2)
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http://en.wikipedia.org/wiki/PowerBook_Duo [wikipedia.org]
http://www.everymac.com/systems/apple/powerbook_d
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(And yes, I know about the PowerBook 150 and it's IDE drive. Shut up.)
Re:laptop use? (Score:5, Informative)
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I think you mean PATA or SATA. IDE stands for Integrated Drive Electronics and simply means that the controller for the hard drive is on-board, and requires a suitable host. PATA and SATA are simply two different for the host to communicate with an IDE drive.
We are used to equating IDE and PATA because PATA was the only widespread method of connection between the host and the drive. So while we all understand what you imply by saying "IDE or SATA", it is more correct to say "PATA or
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I've also seen these 2.5" server drives used in cluster heads and RAID/SAN/NAS boxes as the OS boot disk. You can easily fit 16 regular 3.5 disks plus one of these, a slimline CD/DVD and floppy in a 4U case.
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It ought to be fairly simple for Seagate to produce the same drive in an IDE or SATA model, by replacing the controller, using the same physical structure and technology, if there's a demand for this in high end "desktop replacement" not
Breaking the bottleneck (Score:4, Interesting)
http://vistahelpforum.com/ [vistahelpforum.com]
Re:Breaking the bottleneck (Score:5, Funny)
So that's where Ted Stephens got his analogy. I had no idea he was such a fan of the Turing awards.
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SAS is a little disappointing (Score:2)
SAS is pretty similar to SATA in physical connections, and most SAS cards support having SATA drives plugged into them. Sadly it doesn't work the other way around: you can't plug a SAS drive into a SATA connector.
It's a pity that they didn't sort this out, as drives like this would be nice for workstation users looking for a little speed boost.
Of course, it looks like
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SAS is about more than speed (Score:2, Informative)
Seagate Research presented a good technical article [usenix.org] on SCSI vs. SATA back in 2003. Much of this is still relevant today (though
Re:SAS is a little disappointing (Score:5, Informative)
If you're a workstation user looking for a speed boost, then you use SCSI or SAS drives with a proper controller like workstations have since 1990.
And Flash drives have almost no chance of penetration in the server market, which is where this drive is being targeted (not at Laptop or Workstation users). Don't let the 2.5" form factor make you think it's for laptops, it's for high density servers or blades.
Flash Drives (Score:2)
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What do you mean? I fully expect that rotating drives are on their way out. There's too many advantages to flash and the disadvantages with using SSDs in a server environment are being worked out as_we_speak. I'm willing to wager that within 3 years SSDs will beat high end HDDs in every desirable metric sans price- and price is just a matter of time.
I doubt SSDs are going to come within a bull's roar of magnetic media in terms of cost-effectiveness any time soon (if they ever do).
What I *can* see, is the
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Just so. Except one detail: This isn't the 1980s any more. Buying or designing the IP for a SCSI aware controller is simple&cheap. The fab costs are not likely to be more than for SATA. So, this
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SCSI doesn't offer any "speed boost" over ATA either and SAS is certainly not faster than SATA. It's the devices that may or may not be faster.
Finally, solid state storage has been used to accelerate server apps for decades.
This is apparently not your area of expertise.
What's so astounding about 15k rpm? (Score:2, Informative)
Re:What's so astounding about 15k rpm? (Score:4, Funny)
Re:What's so astounding about 15k rpm? (Score:4, Interesting)
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One of the applications for these drives are systems that are performance limited by access time and not capacity that can not yet use solid state storage. In a lot of very large storage installations, the existing arrays are already capacity underutilized because excess spindles and actuators have to be added to lower the average access time for multiple requests. It is not uncommon to not eve
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I think the show-stopper here is that the drive stated capacities are still sma
Nice, but not big news. (Score:5, Insightful)
By only using a 2.5" drive rather than 3.5 of course the average seek time is lower, because the read head doesn't have the extra 1" to cover. This is at the expense of all that extra storage area.
You could get just about as high an average seek if you partitioned up a 3.5" 15K drive and only kept data on the inner partition.
It's nice that they have these, but it's really not that super special. Why is this front page news?
BTW, your laptop is going to need some serious cooling to use this, as 15K drives do get rather warm.
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>> seek time is lower, because the read head doesn't have the
>> extra 1" to cover.
it's even more trivial than you paint. The 2.5 and 3.5 numbers
represent diameter, but the head only travels on one side of
the disk so to it the difference is only 0.5 inch as far as it
is concerned.
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This now makes the form factor even more competitive in IO-sensitive applications, and I dare say Slashdot has enough users interested in such a thing to warrant a FPP.
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Maybe it's not super special... but check this paper out. [seagate.com] Figure 1 in particular (yeah... they are comparing 10k 3.5" to 10k 2.5"... it's an old paper, but the theory is the same.)
Who would want faster 2.5" drives? People who want 6 drives in 1U instead of in 2U. People who want faster drives in their blade servers.
Re:Nice, but not big news. (Score:4, Informative)
The people for whom these high end disks are intended aren't concerned with the "storage area" of individual devices. They care about the ratio of storage to spindles and arms. They buy things like this [tpc.org].
Why is this front page news?
Because it's a site about stuff geeks want to read. It's actually rather nice to hit the page and find some news about the latest incremental change in storage, as opposed to more [slashdot.org] move-slash, dot-on politics [slashdot.org].
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Wouldn't it be better to put the partition at the outer edge of the disk, where you get higher data rates and more data per cylinder (and thus less head movement to get from beginning to end of the partition)?
I must have ordered from the future!!!! (Score:2)
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How many seek/ECC errors does it give?? (Score:2, Interesting)
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You're right, everyone has stories. I have 2 4 drive WD arrays that have been around for 3 and 2 years, no failures there. But I wouldn't trust any data to an IBM or a Maxtor drive.
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Most of those deaths were directly related to heat issues (poor cooling or poor airflow). Some were undetermined cause.
From my experience over the past decade, heat is the #1 killer. Some makes / models are better at dealing with 50C+ temperatures then others. Maxtors seemed to be a bit sensitive to anything above 50C (and Maxtor drives were a real PIT
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On a side note, the hard disk in my laptop thinks that the Min/Max temps it's seen while operating is 52C/65528C. Now
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I've had a few Seagate die on me for various reasons like cooling, etc, but I would have trusted them in the past. I've had no issues with WD. I still have one that has been running since 2000 without an issue. Maxtors have always crapped out on me. I've had to return the same model twice now.
With Seagate buying Maxtor, the line will be blurred. I would hope that Seagate would bring Maxtor's quality up but I'm afraid it is the other way around.
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I have 4 250gig WD SATA drives (all model WD2500KS). I've had 2 of them for a year and not a single issue. Recently I bought two more and I've had them set up in a RAID0 array for the past 3 months without any problems. I use Acronis True Image just in case, but I haven't had to restore any images yet... IMO, these western digital drives are great, they are fast and quiet, and they cost less than $90 a piece.
One major
Omission from TFA (Score:5, Funny)
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I think it is implausible that it was really spinning as fast as you say.
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the edge of the plate spins 50 meters a second! (Score:5, Interesting)
2.5 inches diameter => ~20cm perimeter at 15k RPMs => 3km/Minute => 50m/s => 180 km/hr.
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That is really fast. So, now use your mad math skills, how fast would it travel if it was 3.5 inches in diameter?
Re:the edge of the plate spins 50 meters a second! (Score:5, Funny)
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Take a look at http://www.llnl.gov/str/pdfs/04_96.2.pdf [llnl.gov]
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Well, it certainly is fast for such a small platter, but I recall servicing the old HP7906 removable platter disks back in the early '80s. During one of our moments of boredom, we did the math, and came up with a figure somewhere around 170mph on the outer edge of the disk. Granted, those platters were huge in comparison. I tried to find some specs, but had no luck in my five min. search.
170 sounds kinda high (Score:2)
I don't remember if it was 3000 or 3300 rpm and manual is at home.
Those made one helluva metal lathe if they crashed the heads tho
At least i wouldn't be scared to turn on this new little drive.....
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At the rim of the platter there's nearly 8,000 g's of centripedal acceleration. I wonder if the engineers have to take into account the gradual stretching out of the disk.
The math: 1.25" radius = .03175 m. .03175 * (1570.796)^2 = 78,339.98 m / s^2.
15,000 rpm = 250 cps = 1,570.796 radians / sec.
acceleration = r * omega^2 =
1 g = 9.8 m/s^2, so acceleration = 7994 g's.
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I posted about the speed of my vintage minicomputer. I have platters that i can see the g-forces trying to pull the alloy platter apart. The magnetic section is darker at the outside. It did pull even more than these little ones and it ran for 15 years. However it used a platter for tracking that would have migrated as fast as the data tracks so maybe it compensated for it. Adding a NEW removable platter may prove unstable now, if there were such a thing
Don't know how these little ones
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Quick answer, yes, but only to the extent that the structural form of the disk has to resist it up to a given tolerance. The rest of the variation is handled in the same way that other variations are handled (e.g., differences in electronic/magnetic component response times, motor speed variations, plate wobble, etc.) which are usually larger. And how do you handle it? Slow it down a bit. If they can mass produce
kinda slow actually....... (Score:2)
Except this is not insane, it is actually slower than my vintage wang minicomputer with the 80MB drive that weighs more than me.
Best guess was 111 mph for this vs almost 125 mph for the Wang from 1980. (about 14" platter at 3000 rpm)
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Is that with or without a spoiler and type R stickers?
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But, about that noise? (Score:2)
That sucker must screech like your ex-wife one day after your alimony payment was due.
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Why the low capacity? (Score:2)
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SCSI drives, while using a 3.5" form factor, use smaller platters inside so that they can spin at the higher rotational speeds. Thus, lower capacity. AFAIK, SCSI drives use the same bit density per square unit of linear measure as SATA/PATA drives.
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73GB doesn't sound so bad when you multiply it by 12 for the number of disks you plan to use.
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Can anyone explain to me why SCSI drives always seem to be lagging IDE in terms of capacity?
The main limitation for bit density on a high speed drive is the channel data rate (since you can't use anything but standard CMOS in a low power, high volume, low margin product.) If you spin faster, at a given maximum bit rate, you lose bit density. Also, for faster seeks, you have to put down more servo information (otherwise you may not see any servo bursts for some time while the head is crossing only data.)
You can generally stuff more data on a platter by spinning it slower. That's why basic 2.5" dri
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They probably have smaller platters, and also, less total platters in the drive. This means the drive has a smaller capacity, but the read head has the advantage of not having to move as far across the disk to read data, reducing latency and increasing performance (AFAIK).
15k rpm -- old, OLD news (Score:2)
Correct me if I'm wrong here: 3.5" x 3.14 = 11 cm circumference, *15,000 = 1.6E5 cm/min,
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Cheeta X15 is a 2.5" platter in a 3.5" chassis (Score:2)
So a 2.5" drive should be a 1.5" platter in a 2.5" drive?
This would mean if we can get the drive down to 1" then we can eliminate the platters eh?
That would be good. Such a drive would have zero latency. It could have zero seek times too. It could be a virtual drive.
It would probably be more than a billion hours between failures!
WOW.
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Heat and power? (Score:2)
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According to this review [techreport.com], the Savvio 2.5" 15K drive uses less power than older 10K drives. Also, it is twice as quiet as previous 10K models, that's pretty impressive IMO.
These drives aren't cheap either, the 36GB version goes for around $450 while the 73GB version goes for around $840.
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You call that a head crash? THIS is a head crash. (Score:2)
(okay, so the platters are a little on the heavy side)
Faster Porn? (Score:5, Funny)
Re:wow (Score:4, Informative)
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It's a common misconception that MTBF is related to lifetime. In fact they are separate parameters.
Failure rates of electronic and other components are usually modelled as a "bathtub". In this model, there is an initial high rate of failures, which rapidly drops off. This is the "infant mortality" period. Then there is a period where there is a low rate of random failures. MTBF
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I don't suppose you'd care to explain that a little? I've always assumed Mean Time Between Failure to be what you got if you took a bunch of drives, ran them until they broke, added up the amount of time they worked for and divided by the number of drives. Which would equate to drive lifetime in my book. Am I missing something? 182 years does seem completely insane..
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Makes sense, and the comment MTBF != drive lifetime becomes comprehensible, thanks!
Re:wow (Score:5, Informative)
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Basically, you test, say, 1000 hard drives for 2 years and you find:
1 fails in the first 8 months...
1 fails in the next 4 months...
1 fails in the next 2 months...
1 fails in the next 1 month...
even after the first two or three you can expect a mean failure time of 15.5 months. This however does take into assumption a bell shaped probability curve. With enough evidence they should be able to know the shape of the drive-fai
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The upshot of this is it's quite reasonable to e
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Most users back then have seen an ST-225 fail. The ST-238R was even worst (same drive but used with RLL instead of MFM).
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Well, those days were a long time ago. Since then Seagate has had horrible reliability problems, solved them, and then backed up their confidence in them with a five year warranty. Since that time Seagate has apparently become one of the most reliable hard disk vendors.
I mean, to put it in perspective, IBM's policy used to be that any software you wrote on an IBM mainframe became the property of IBM. Today, th
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RAM based SSD is nice, but flash based SSD won't touch a decent 15k drive for any write heavy application.
Re:Moving disks are old SSD is in (Score:4, Informative)
The reason "seek time" isn't listed for SSD devices is the same reason dynamic RAM manufacturers don't list "seek time" in their device specifications, namely, it doesn't apply. In storage device parlance "seek time" refers to the time it takes for the drive head to reach the target data on a rotating disk. Read the (ahem) authoritative Wikipedia article here [wikipedia.org].
Furthermore, the recently announce flash-based SSD's from Samsung and SanDisk have file access times far superior to any rotating disk-based storage device. However, it is true that the dynamic RAM-based devices have access times that are approximately 10 times faster than the flash-based devices, but the flash based devices have file acces times typically much more than 10 times faster than a disk drive's seek time. For reference, see the SanDisk press release [sandisk.com] for their SSD device.
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You are correct; I wasn't thinking about write speed, which is typically much slower than read speed f
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Well, there's also the 40-minute battery life to be contend with...but nothing beats that 8.4" Toshiba active matrix display!