【 Weak current College 】 buy u disk must note u disk speed (go)

Today went to computer city bought a USB2.0 PCMCIA transfer of riser card, home to try out OK, but must be combined with a power supply from the USB port of the line. XP and can direct Ubuntu7.10 recognized.

However in buy u disk when toss some time, but also understand some u disk "Maoni" correct some mistakes on their own.

First of all that interface. Previous USB interface with USB1.0, USB1.1, three USB2.0, this is quite clear. USB1.0 is rare; compare older point might be USB1.1 (my own history since the two machines are the USB1.1 =. =), the speed is 12Mbps, is almost 1.5MB/s, and in particular slow; probably 02, is the majority of the USB2.0, this interface bandwidth you can reach 480Mbps, 40 times.

Later learned of the news is that in order to promote the USB, the above three USB are collectively referred to as USB2.0, original 1.1 and 2.0 to FullSpeed and HighSpeed distinction. Here is a problem in one place, the result is what is called USB2.0, not sure who did not pay attention to the Full or High. But the good news is that now the basic interface is HighSpeed, that is I think the real USB2.0.

It is now the most important fact is the u disk speed, not the speed of the interface. USBHi-Speed is 480Mbps, but it's just a theory, the hard drive is generally not exceed such high speeds. As long as it is not a limitation of USB1.1 interface (usually two, u disk itself is USB1.1 interface, now rarely; the other is the computer are USB1.1 interface, my computer just > _ <), then the interface type is not important, then you want to see u disk itself can reach speeds. The simple point that is similar to a normal SD card and a high-speed SD cards.

Thought as long as the interface, then Hi-Speed speed does not slow my mind think of speed will be 10MB/s (actually I too optimistic ... ）。 Began to see is the price crunch 8GU plate, so run to buy. Home to a test, speed was only about 1.5MB/s, a 600M movie took 6 minutes. But Ithought this fool himself of speed copying entire 8G need four hours, in fact probably almost an hour. The speed that I simply cannot believe that in order to copy the content of the 8G wait so long, is not worth it, even if it is 1 g for 10 minutes too long, because my mobile hard drive is probably less than half a minute. Of course, I exclude my machine USB1.1, because after all, the riser card.

Then run back to computer city, try Kingston's 1GU spare, results of the speed and power. Last try a yuzhan 8G, actually found handcuffed 600M content less than 2 minutes. Conversion, probably this speed is 6MB/s, compared to the other two basic is 4 times the gap. Things to do, I also met ~ ~ at least 1MB/s faster ~ ~ just mind the strange thing is, why is the ratio of how much your didn't Taiwan power and speed is 3 times faster that the yuzhan 8G hear?

But I'd taken ~ ~ this is the Internet only to find, in fact, this is the price the yuzhan 8G and than that Taipower 8G also cheap. EH.

Of course, capacity and prices do not say that it is the first concern. I just want to remind one, speed, u disk read and write speed of the actual, or chip speed. Of course, if you can bear 1.5MB/s speed, it does not matter.

However, one needs to worry about is that u disk read and write times for life ... The problem that is even more impossible to verify.