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Conclusion

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There are two ways of looking at Seagate’s new Momentus XT. If you know that the drive pairs rotating storage with 4GB of SLC NAND flash memory, then you probably expect a lot from this new product. I have to admit that this happened to us atfirst, because we started with low-level testing due to lack of sufficient time. The benchmarks on Windows and application startup time were added a few days later and these change the game.

However, looking at the product name allows us to take the position and standpoint that is most appropriate when looking at this product: the Momentus XT is a hard drive! It just happens to utilize flash memory in an effort to improve performance. Once we treat it like a hard drive, then we shed the performance expectations to which it can't live up. Yet, the Momentus XT is one of the most innovative storage products in years, and it delivers in real life.

All performance numbers we’ve seen are at least good, as the Momentus XT outperforms all 7,200 RPM 500GB competitors in the majority of our benchmarks. It is the fastest 2.5” drive when it comes to throughput and I/Os, it has good application performance and it delivers great scores on SYSmark 2007 as well, which is based on real applications. There are a few benchmarks in which the drive shows a few small glitches, which may be the price we pay for Adaptive Memory trying to optimize. We also have to mention that power consumption of this drive is slightly higher than other drives on average, which results in shorter battery runtime on notebooks.

Many of the test results should be seen be seen as worst-case results, as the numbers can only get better over time. In the end, we don’t see real disadvantages for the Momentus XT, except the somewhat-higher power requirements compared to competing 500GB drives. However, the drive aims at the segment of enthusiast and workstation laptops, and it delivers excellent performance for a hard drive.The concept of pairing a hard drive with a bit of flash memory works well. We tasted blood with the Momentus XT and we can only recommend true enthusiasts to go for this one instead of a conventional drive.

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jsowoc 05/24/2010 2:27 PM
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-19+

I think these hybrid drives need an all-new testing methodology that is neither like a hard drive (as you have classified it) nor a pure SSD, nor even simply the sum of the two tests.

You mentioned that performance *might* improve if the benchmarks were rerun. Could you re-run PCMark 3 times and see if the 3rd time is any faster than the first? The idea being that the first time is simply the hard drive, and hopefully by the 3rd (or 4th time), the data ends up in the flash.

mavroxur 05/24/2010 2:28 PM
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-18+

Am I the only one that's not impressed in the least?

cbrei10213 05/24/2010 3:16 PM
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-14+

Im not. I would easily shell out the money for an 80GB ssd if it also included 500G of mechanical storage. 4G is nothing. Absolutely worthless for this. Give us something real and this will be nice.

jtt283 05/24/2010 3:21 PM
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-0+

I absolutely agree with the conclusion. You look at this like a hard drive. In some things, it appears to outperform the competition, and the price is not unreasonable. For too many other things, it is no better, or even worse. I think it is promising, but as essentially "1.0" tech, it is a little underwhelming. Hopefully all it needs is a few minor tweaks.

nforce4max 05/24/2010 3:23 PM
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cknobman 05/24/2010 3:25 PM
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Ciuy 05/24/2010 3:24 PM
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-6+

First samples are always less impressive, but i bet this hybrid tech will be the future, atleast in a small part, of the HDD market. Ssd`s are to expensive with low cap. In 2-3 months there will be great hybrid hdds for sale.

ksa-_-jed 05/24/2010 3:27 PM
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-11+

I think is better to wait for ssd price to go down

sublifer 05/24/2010 3:46 PM
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-1+

I agree, that was rather pathetic. I expected it to at least out-perform 3.5" hard drives (smaller platter + same speed 7200rpm should = faster access, reads and writes) instead we get a last gen 2.5" drive where they added 4GB flash as a buffer and poorly utilized at that, and call it a hybrid. The idea behind hybrids is to get the best of both contributors. In this case it should be capacity of hdd plus the speed of ssd. This thing wasn't anywhere near an ssd in performance and it was a sad misuse of the "hybrid" term.

Good review though guys. Very thorough. Its clear that Seagate needs to get back to the drawing board. Perhaps start with an ssd and work on adding hdd platter storage to it instead of trying to work in the other direction.

matt_b 05/24/2010 3:50 PM
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-3+

mavroxur :
Am I the only one that's not impressed in the least?


Definitely not. Just looking at the benches, the "WOW!" factor just isn't there. Price considerations, I'm not even sure if I'd buy one if there were no price differences with a conventional platter-only drive. Some things were marginal, but it also took some hits. In a notebook/laptop environment, power consumption is not the department you want to see one of those hits. If there is a future to this as the alternative to SSD only drives, then the technology is far from perfected with this as an example.....

jrazor247 05/24/2010 4:19 PM
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-3+

Is this written for an alternate universe where HD tach or better benchmark utilities don't exist?
How bout graph of throughput and seek times over drive geometry?
More practical is if the effectiveness of their algorithm. I'd be satisfied with some junk adapter that just spans flash memory with disk space if you could ensure the OS partition is on the flash portion of geometry.

Pei-chen 05/24/2010 4:20 PM
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aaruni123 05/24/2010 4:24 PM
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-7+

nah we still want cheap SSDs

snotling 05/24/2010 4:29 PM
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-9+

Anandtech.com has a different set of benchmarks his conclusion is that it has the performance level of A velociraptor.

shin0bi272 05/24/2010 4:55 PM
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Anonymous 05/24/2010 5:06 PM
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-12+

is it me or was the benchmarking ill conceived for such a device, the speed boost will only occur once the darn thing learns from your habits, how many times were each benchmark run can we get some stats to see if on running the same benchmark a second time yields a speed boost, or maybe an nth number of times, how many times would an application need to be run before it gets cached, once cached how much better does it perform, how comes there wasn't a windows boot up time test? im pretty sure this drive would have been pre-optimized to cache windows system files

you can't just throw a bunch of random benchmark at this thing and expect it to perform other then a standard drive. Come on now we talking about THG here, your not suppose to miss this kind of stuff.....

Anonymous 05/24/2010 5:32 PM
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-4+

The standard set of benchmarks used here doesn't really reflect normal usage where this drive is supposed to shine. Some common tasks like windows startup, application start and such done repeatedly until there is no improvement in loading times would have been nice.

dgingeri 05/24/2010 5:34 PM
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-3+

I have a suggestion on how they could turn this into a write cache as well as a read cache: separate logic and SLC flash storage specifically for writes. This could be half or same capacity as the read SLC cache. The writes get handed off to the drive logic for writing, enabling the OS to continue on, and the write cache continues on in the background.

This would also allow for higher data integrity and security. Encryption could also be done through this method.

It would drive the cost of the drive up a little, but it would still be cheaper than a SSD, and many things would perform almost as well.

Although, I doubt anyone at Seagate would read this...

elel 05/24/2010 5:44 PM
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-1+

I agree. I think you guys should give another chance and see how much repetition helps it out, especially in OS startup.

rkhpedersen 05/24/2010 6:32 PM
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-5+

Maybe the test, not the drive is flawed. According to Anandtec the drive outperforms the Velociraptor by a solid margin - meaning if you don't have the money for a SSD this is the best drive available.


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