16mb cache as good as 10k rpm

By ripken204 ยท 8 replies
Feb 26, 2005
  1. ive heard that 16mb cache as good as 10k rpm for a hdd, is that true?
  2. Nodsu

    Nodsu TS Rookie Posts: 5,837   +6

    No it is not.

    You can't even compare the two because they are completely different things.

    You might as well say that 2MB of CPU cache is just as good as PC4000 memory.
  3. Bobcat1132

    Bobcat1132 TS Rookie Posts: 79

    rpm have to do with hard drives and cache has to do with cpu's
  4. zephead

    zephead TechSpot Paladin Posts: 1,569

    it's a bit like the common saying (regarding car engines) "there's no replacement for displacement"
  5. Rick

    Rick TechSpot Staff Posts: 4,572   +65

    "ive heard that 16mb cache as good as 10k rpm for a hdd, is that true?"

  6. tdeg

    tdeg TS Rookie Posts: 119

    He's talking about cache built into the harddrives. Most harddrives have a limited amount of cache built into them now to act as a buffer.
  7. Bobcat1132

    Bobcat1132 TS Rookie Posts: 79

    my bad i totally forgot about the hdd having built in cache. thanx for the reminder... and in that case i dont know enough about hdd cache to coment
  8. Bobcat1132

    Bobcat1132 TS Rookie Posts: 79

    sorry guys, i do remember hearing something about cache on hdd's and a 16mg cache hdd at 10k rpm is going to be quite a bit faster than a 8mg cache hdd running at the same rpm's i have a friend who has a maxtor 350g hdd at 16meg cache and he says that there is a huge difference in performance. its not that it would be equal to 10k rpm but it would boost the performance as they are two seperate areas of the hdd working together for the best performance. i have never used a 16mg cache hdd myself however so i cant say from a personal viewpoint but it makes sense and i would and do plan on getting one myself soon hopefully that will answer a few questions bobcat
  9. Bobcat1132

    Bobcat1132 TS Rookie Posts: 79

    Pronounced cash, a special high-speed storage mechanism. It can be either a reserved section of main memory or an independent high-speed storage device. Two types of caching are commonly used in personal computers: memory caching and disk caching.

    A memory cache, sometimes called a cache store or RAM cache, is a portion of memory made of high-speed static RAM (SRAM) instead of the slower and cheaper dynamic RAM (DRAM) used for main memory. Memory caching is effective because most programs access the same data or instructions over and over. By keeping as much of this information as possible in SRAM, the computer avoids accessing the slower DRAM.

    Some memory caches are built into the architecture of microprocessors. The Intel 80486 microprocessor, for example, contains an 8K memory cache, and the Pentium has a 16K cache. Such internal caches are often called Level 1 (L1) caches. Most modern PCs also come with external cache memory, called Level 2 (L2) caches. These caches sit between the CPU and the DRAM. Like L1 caches, L2 caches are composed of SRAM but they are much larger.

    Disk caching works under the same principle as memory caching, but instead of using high-speed SRAM, a disk cache uses conventional main memory. The most recently accessed data from the disk (as well as adjacent sectors) is stored in a memory buffer. When a program needs to access data from the disk, it first checks the disk cache to see if the data is there. Disk caching can dramatically improve the performance of applications, because accessing a byte of data in RAM can be thousands of times faster than accessing a byte on a hard disk.

    When data is found in the cache, it is called a cache hit, and the effectiveness of a cache is judged by its hit rate. Many cache systems use a technique known as smart caching, in which the system can recognize certain types of frequently used data. The strategies for determining which information should be kept in the cache constitute some of the more interesting problems in computer science.
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