Although DVD burning faster and faster, but I heard "in the future the actual write speed is not as fast as the specifications said," Why is this? In addition, it also increased the speed limit?
Decided to use DVD recorder is one of the factors that speed. Because of the greater speed, write data, the shorter the time required.
For the DVD, the 1 second to write 1350KB of data "and speed", that is, 2x speed drive writes data to 2700KB / s, 4 speed is 5400KB / sec.
DVD burner, etc. from the original speed to 4x, and marked shortening of the time is proportional to the speed of, for example, under such speed write 4.7GB of data about 60 minutes, 30 minutes 2x, 4x 15 minutes. But if speed is more than 8 can not let it go, supposedly 8x 4.7GB of data should be written under 7.5 minutes, but in fact it takes about 10 minutes, and will appear 16X takes about 6 minutes.
鈼?Write the relationship between speed and time (to write about 4.7GB of data)
Marked in the product specifications in the figures is the write speed of the "maximum" speed. The actual current DVD-R write speeds up to 8x, DVD + R up to 12X, over these 8x burner, the speed is not to burn all the discs, but in some areas with the greatest speed recording.
鈻?16-speed is limited to the most peripheral
This is because, in the CD drive and DVD recorders, by rotating the disc to burn and read data on the device, the disc rotation frequency is in the physical limit. Determined by the physical properties, if the rotation frequency of more than 10,000 turn Mei minutes, the disc will be abnormal, there may be crushed. For this reason, the disc drive to control the rotation frequency.
As the 4-speed disc rotation frequency of the following fail Mei minutes 10 000 switch, so the whole disc can be written with the greatest speed. However, to achieve 8-speed, disc structure, due to actions, and within weeks, some more than 10 000 turn per minute, so within a week to write Department of speed control speed in the 4 to 6 daily, each minute part of less than 10,000 rpm District 8-speed write.
Since this is not due to 8x write the entire disc, and therefore can not be labeled according to specifications in the pro rata rate of shortening of the time. If the speed is 16 words, can actually write the region with the highest speed is smaller than 8x.
鈼?16 time speed 鈮?1 / 16
鈻?disc rotation in order to control the number of sub-10 000 turn in Mei within the need to separately adjust the position of the disc write speed. Only the outer ring of 16-speed write:
In addition, in the end to how much the convenience to enjoy high-speed, but also on the capacity to write data, because DVD discs are generally write from the inside out. In other words, more than 8x speed burner, just write the data capacity is small, you can arrive before the end of the most high-speed write. To enjoy high-speed 8x or more to bring the convenience, only to write nearly 4.7GB of high-capacity data. In addition, the DVD is concerned, the most outer ring under 16X speed close to 10 000 per minute change, already facing limit.
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