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How to compare solid state disks to standard SATA disks ?
Is an SSD faster than a standard rotationg SATA ?
The jargon is hard to get past. I get the impression that the SSD is just small and low power, rather than fast. johns |
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How to compare solid state disks to standard SATA disks ?
On Sep 26, 6:14*pm, johns wrote:
Is an SSD faster than a standard rotationg SATA ? The jargon is hard to get past. I get the impression that the SSD is just small and low power, rather than fast. johns SSD read speed is faster than rotating SATA, SSD write speed is about the same, b/c on write SSD 1st has to erace then write. Primary benefits of SSD a 1) Vibration insensitive. You can use tem to record data on helicopters, cars etc. 2) lower heat generation than rotating. 3) faster read speed. in about all other respects SSD is not whole lot better than standard rotating. The really high quality SSDs that totaly kick butt of rotating are custom build and cost about $1k per GB of storage. |
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How to compare solid state disks to standard SATA disks ?
johns wrote:
Is an SSD faster than a standard rotationg SATA ? The jargon is hard to get past. I get the impression that the SSD is just small and low power, rather than fast. johns Lower seek time. 1) USB flash is around 1msec seek time, due to the protocol. 2) SATA flash is around 0.1msec seek time. The ability to do random access, without head movement, is an asset. The trick would be finding a controller for the devices, that caches writes until enough are available to write efficiently to the flash. AFAIK, writing small quantities of data, involves read-modify-write operations, whereas writing at the natural block size would avoid that overhead. http://mtron.easyco.com/news/papers/...benchmarks.pdf There is also a good deal of variation, between brands and implementations. Some flash devices are an insult to the concept, and if purchased, will give you the wrong impression. It's more of a "wait and see" technology right now. An SSD based on DRAM, doesn't have an issue with writes - if you can afford it. Paul |
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How to compare solid state disks to standard SATA disks ?
johns wrote:
Is an SSD faster than a standard rotationg SATA ? The jargon is hard to get past. I get the impression that the SSD is just small and low power, rather than fast. johns It all depends on the SSD. There are a few different types and a wide range of performance. Ari -- spammage trappage: remove the underscores to reply Many people around the world are waiting for a marrow transplant. Please volunteer to be a marrow donor and literally save someone's life: http://www.abmdr.org.au/ http://www.marrow.org/ |
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How to compare solid state disks to standard SATA disks ?
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How to compare solid state disks to standard SATA disks ?
"Conor" wrote...
Is an SSD faster than a standard rotationg SATA ? The jargon is hard to get past. I get the impression that the SSD is just small and low power, rather than fast. Some are faster whilst others are slower. The "mechanical" HDD brigade have upped their game though. Power wise, there's not a lot in it. I'd wait another 6 months as it's a new technology and improvements are being made all the time. Maximum PC magazine just did a review of several SSDs. The short version is that there are 2 major versions right now: SLD and MLD (Single- and Multi-Level Device) flash RAM chips. The SLD are "good" and the MLD are "cheaper." The cheaper MLD devices are WAY too slow on writes to replace a "performance" HDD. The SLD devices are comparable in performance to HDDs, but $800+ for the current 64 GB variety. |
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