This means the cache will hold data that your programs are frequently using. This is called the “Principle of locality” - once you start working in an area, you tend to stay in that area.
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Related Article: How to buy an external USB hard driveĭisk cache works based on routines that are built upon these three (3) assumptions. Data is not cached every time and this feature is beneficial on a few occasions. Wear and tear are also reduced because there is less read/write movement by the disk head across the hard disk. This has the effect of higher disk speed and increased efficiency of data transfer between the drive and the computer. The purpose of the buffer is to keep some data and to move it to and from the drive. Some SSDs have caches of 4GB while older hard drives had disk buffers of between 2MB and 4MB. Modern Disk Cache ranges from 8MB to 256MB. The size of memory needed is mostly very small because cached data is rarely used again by the system. A disk cache uses the speed advantage of memory to bolster effective disc speeds. This is six orders of magnitude difference. Memory (RAM) responds in tens of nanoseconds whilst disk response time is in the tens of milliseconds. The analogy of considering hard disk cache to be the RAM for the hard drive fits very well. Hard drives have a “microcontroller” embedded whose purpose is to create, keep and transfer data that is cached in the buffer. It stores data on transit to and from the hard disk.
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