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#11
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Corsair vs Kingston USB
On Sat, 24 Mar 2007 11:03:41 -0500, Yugo
wrote: Anton Ertl wrote: Yugo writes: Oopsie, daisy, I didn't knwo that. I'll check. What is considered a good R/W spped ? Beyond 25MB/s. - anton According to this: USB supports three data rates: * A Low Speed rate of up to 1.5 Mbit/s (187.5 kB/s) that is mostly used for Human Interface Devices (HID) such as keyboards, mice, and joysticks. * A Full Speed rate of up to 12 Mbit/s (1.5 MB/s). Full Speed was the fastest rate before the USB 2.0 specification and many devices fall back to Full Speed. Full Speed devices divide the USB bandwidth between them in a first-come first-served basis and it is not uncommon to run out of bandwidth with several isochronous devices. All USB Hubs support Full Speed. * A Hi-Speed rate of up to 480 Mbit/s (60 MB/s). Forget about these, assuming you are buying a modern product it will be USB hi-speed. We are not talking about the USB speed, we are talking about the product read and write speed. Different products using the same Hi-Speed USB2 interface can and often do vary quite a lot in their actual performance in writing (mostly) and reading (to a lesser extent, when talking about 4GB sizes). Hubs, even Hi-Speed hubs, serving a number of non-hi-speed devices, are likely to divide up a total bandwidth of 12 Mbit/s for such devices, which will slow them down unless the hub has transaction translator for each port. [3] Ignore this too, we are talking about what the product manufacturer specs as the READ and WRITE speed. Nothing else/other/different/not-usb. Though Hi-Speed devices are commonly referred to as "USB 2.0" and advertised as "up to 480 Mbit/s", not all USB 2.0 devices are Hi-Speed. Hi-speed devices typically only operate at half of the full theoretical (60 MB/s) data throughput rate. The maximum rate currently (2006) attained with real devices is about half, 30 MB/s.[4] Most hi-speed USB devices typically operate at much slower speeds, often about 3 MB/s overall, sometimes up to 10-20 MB/s. The USB-IF certifies devices and provides licenses to use special marketing logos for either "Basic-Speed" (low and full) or Hi-Speed after passing a compliancy test and paying a licensing fee. All devices are tested according to the latest spec, so recently-compliant Low Speed devices are also 2.0. http://en.wikipedia.org/wiki/USB So, yes, above 25 MB/s should be pretty good. I suppose I'll have to pay a visit to Tom's hardware to learn more. Followups set to originals It is unrealistic to expect 25MB/s write speed from most, and even those spec'ing it, will tend to have a real-world figure lower than this. It might read at 25MB/s though. |
#12
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Corsair vs Kingston USB
kony wrote:
Ignore this too, we are talking about what the product manufacturer specs as the READ and WRITE speed. Very interesting, Kony. It would be nice of you if you could provide "specs as the READ and WRITE speed" of any USB2 key on either Corsair or Kingston sites. Thanks again! |
#13
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Corsair vs Kingston USB
On Sun, 25 Mar 2007 22:32:36 -0500, Yugo
wrote: kony wrote: Ignore this too, we are talking about what the product manufacturer specs as the READ and WRITE speed. Very interesting, Kony. It would be nice of you if you could provide "specs as the READ and WRITE speed" of any USB2 key on either Corsair or Kingston sites. Thanks again! The answer is no, because you are equally capable of going to their website and seeking a read and write speed. "read", "write", not "USB". It's just that simple. Go to their website and check. As I'd already mentioned, when a manufacturer fails to mention any speed it is because it is not fast enough to be rated, it is their lowest speed product, slower than everything else modern. |
#14
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Corsair vs Kingston USB
kony wrote:
It would be nice of you if you could provide "specs as the READ and WRITE speed" of any USB2 key on either Corsair or Kingston sites. The answer is no, because you are equally capable of going to their website and seeking a read and write speed. "read", "write", not "USB". It's just that simple. Providing the links wouldn't have taken 1/10 of the time who took to write your silly messages. Trolling on newsgroups is pretty simple too! |
#15
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Corsair vs Kingston USB
On Mon, 26 Mar 2007 23:49:14 -0500, Yugo
wrote: kony wrote: It would be nice of you if you could provide "specs as the READ and WRITE speed" of any USB2 key on either Corsair or Kingston sites. The answer is no, because you are equally capable of going to their website and seeking a read and write speed. "read", "write", not "USB". It's just that simple. Providing the links wouldn't have taken 1/10 of the time who took to write your silly messages. Trolling on newsgroups is pretty simple too! You have worn out your welcome. |
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