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eSATA Maximum Speed?

by markpregen / March 15, 2008 11:14 AM PDT

Wikipedia says SATA 3.0 Gbits/s should provide speeds of 300 MBytes/sec.

The most I'm seeing with HD Tach (freeware benchmark program) is about 212 MBytes/sec (burst speed) for my External ACOMData 1 TB drive. Ironically, that drive claims it only supports 1.5 Gbits/sec max (or 150 MBytes/sec). Whereas my External WD MyBook Home Edition 1 TB only gets up to about 144 MBytes/sec (burst speed), and that drive says it supports 3.0 Gbits/sec max. I'm running a SATA to eSATA cable directly off my motherboard (brand new ASUS, supports SATA 3.0 Gbits/s. Anything I can do to improve my speeds? I'm running a brand new QuadCore AMD 2.2 Ghz so I don't think that's the problem (3 GB DDR2 RAM). Windows XP Pro. I'm also not running any extra software or programs in the background which might impact the benchmarks. Thanks.

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you're fine
by obobskivich / March 15, 2008 4:20 PM PDT
In reply to: eSATA Maximum Speed?

there isn't anything "robbing you of speed" here, both of those figures are great for external storage devices

the honest to god truth is that even the fancy SATAII/NCQ/16MB (or 32MB) cache drives with all of the latest features and what not

will still only sustain around 65-80MB/s throughput, just due to the physical limitation of their rotational speed and a few other factors

just because the interface specifies a certain speed, doesn't mean the device can, or has to, run at that speed

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And, remember this. . .
by Coryphaeus / March 15, 2008 11:10 PM PDT
In reply to: eSATA Maximum Speed?
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well it isn't really lab speeds
by obobskivich / March 16, 2008 7:14 AM PDT

its the peak throughput of the bus

Wired 10/100 will run at 100 Mb/s, however a portion of it is overhead (due to how IP packets are encoded), the same is true for Gigabit, so you are actually getting a full 1000Mb/s of throughput, but only around 800-something is usable due to overhead

As far as WiFi, it depends on connection to the base station, if you've got a perfect connection, its just overhead and latency that are your problem, although you do get the full connection speed.

SATA isn't the same scenario, between SATA I and SATA II interfaces, they changed (fundamentally) nothing on the hard-drive, its the same reason "old" PATA-100 and PATA-133 will keep up with SATA I and II (assuming same aged internal technology), because its still a few platters at 7200 RPM with the same read/write equipment

the reason modern SATA II drives are faster than old PATA-100's is other advancements, like higher density per platter, more cache, NCQ, perpendicular recording, etc, but it still doesn't count for a HUGE gain (figure we've gone from ~45-50MB/s to ~65-70MB/s in ideal situations (meaning sequential access))

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They do... ;)
by josetocadisco / March 26, 2011 6:15 AM PDT

802.11 B works @ 11 Megabits per second = 1.375 Megabytes per second.
802.11 G runs @ 54 Megabits per second = 6.75 Megabytes per second.
100/10 LAN works at 100 Megabits per second = 12.5 Megabytes per second.
and at last, Gigabit works at 1000 Megabits per second = 125 Megabytes per second.


Good Eve!

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