Rotationl Speed

Disk Cache with memory is a memory chip controller, fast speed, it is hard to access and external interface between internal storage buffer. Due to the internal data transmission speed and external interface transmission speed, eg play a role. Cache size and speed is directly related to the transmission speed drive the important factors, can greatly improve the overall performance disk. When the hard disk access to data bits continuously in the hard disk and exchange data between memory, if have large cache, can put those fragmentary temporary data cache, reduce the existing system load, and improve the speed of data transmission. cocktail dresses
Hard disk cache on three main functions: one is to proofread. When the CPU control began to drive is read data on the hard drive control chip can control the head of the cluster is read a few cluster the data or read the cache (due to the hard disk storage of data is continuous, therefore, when shooting read to read a few cluster the data or, hard disk is not need to read data, the cached data transmission directly into memory can, because the cache and is far more rapid than the head of speed, so can obviously evening dressesimprove the performance of the objective to, Two is to write out cache. When the data from disk write instructions, will not immediately after the blanks, but first temporarily stored in the buffer and then sends a “data has been written into the” signal to system, this system will think data has been written, and continue to work hard, and below in leisure reading or writing (not) be cached data when writing to the blanks. Although there are certain properties of write data, but also inevitably leads to the safe hidden trouble — if data is in the cache when suddenly drop, then the data would be lost. For this problem, the hard disk manufacturers nature also have solution: power, head will be cached data into the inertia of zero magnetic way outside of the temporary area, and start again until the next destination; write these data, The third effect is temporary storage recently visited data. Sometimes, and some data is often need access to the internal cache, hard disk will read frequently some data stored in the cache read again, can be directly from the cache direct transmission. formal gowns