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Author Topic: Build 1.5 Mb disk drive?  (Read 2715 times)

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Offline Piru

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Re: Build 1.5 Mb disk drive?
« on: October 22, 2005, 06:33:40 PM »
I know amiga HD floppy drive managed to put 1.71MB to normal 80 track disk (11 sectors per track), but I have never heard of 1.5MB drive...
 

Offline Piru

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Re: Build 1.5 Mb disk drive?
« Reply #1 on: October 22, 2005, 07:24:16 PM »
Well, it all depends on how you calculate it.

It's 2*160*11*512 bytes, 1760 KiB, 1.71875 MiB.

However, for some weird reason PC floppy capacity is described with kilobytes/1000 megabytes, not kilobytes/1024. Using this logic, a PC HD floppy is:

2*80*9*512 bytes, 1440 KiB, 1.40625 MiB. But, if you divide by 1000 and not 1024, you get 1.44 MB.

So indeed if you use this fubared logic you get 1.76 MB. This is not the true capacity, however.

For floppy capacity it seems PC lusers would like us to use 1024 byte kilobytes and 1000 kilobyte megabytes. No thank you, I prefer some consistency here...


[EDIT]
Ok, spotted a rounding error in my original post.. Should have been 1.72MB. :)
[/EDIT]