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32 GB SD card is coming!
On Jan 14, 8:02*pm, Jürgen Exner wrote:
wrote: Jürgen Exner wrote: wrote: [SD cards] 1. Why do they multiply in the order of 1,2,4,8,16,32, etc. Why not in nice number like 5, 10, 20, 30, 40, 50 GB, etc (metric)? Because the native language of the computers we have today is binary, not decimal. Hard drives come in non-binary sizes, and sometimes oddball ones at that. Apples and oranges. There is quite some difference between the internal workings of a HD and a memory chip. For a harddrive the numbers of heads, tracks, sectors, and disks introduce factors, that are determined by physical characteristics, not logical considerations. On a memory chip to supply 10x still requries 16x of items of whatever you are looking at. So why waste waste the remaining 6 items? I'm not sure exactly what you're getting at. It would still be possible to make a non base 2 number of rows or columns and get the whole thing to work. it's generally a lot easier to do the math (addressing) since most arithmetic is done in base 2. In certain embedded memory applications, you might want to squeeze some sort of oddball array size in there. I've done that at my jobs. The layout tools can accomplish pretty much anything. Sometimes unique considerations mean dropping in three base 2 memory arrays. |
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