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#1 |
Senior Member
Join Date: Aug 2002
Posts: 382
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I just got a Sandisk 512 MB Memory Stick Pro for a Christmas present.
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#2 |
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Join Date: Dec 2003
Posts: 2
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I think that the trick is the difference between Mb (MegoBytes) and Mo (MegaOctets), with the conversion 1000 Mo = 1024 Mb or 1024 Mo = 1000 Mb (I can never remember
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#3 |
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Join Date: Aug 2003
Posts: 49
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> ... Sandisk 512 MB Memory Stick Pro ...
> ... capacity is only 468 MB! Some applications report decimal MB=1,000,000 bytes Some report "binary" MB=1,048,576 bytes If the actual raw capacity of the MSp is 512,000,000 bytes, an app reporting "binary" MB will show 488 MB Storage vendors tend to report decimal MB, because it inflates the number. What apps report is so inconsistent as to be useless, unless they report raw byte counts. And if what you are looking at is space available in the file system, there's also some loss for FAT32 filesystem overhead, and possibly some space for one or more index files created by the camera. |
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#4 |
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Join Date: Dec 2003
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I had the idea but you have the math explanation
![]() good job, iŽll try to remember the count this time :idea: |
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#5 | |
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#6 |
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> Even so, the stick only has 490,930,000 bytes of
> capacity, which is less than 512 MB regardless of > how you define a megabyte. Yep. Reports of 488 to 490 MB seem to be common for "512" flash memories. SanDisk openly admits that they use decimal MB: http://www.sandisk.com/tech/faq/30.html Other subtractions in the shortage are: - filesystem overhead - CHS truncation - mapped-out bad sectors This sort of false advertising is not likely to change until lots of people return sticks, or until some Attorney General upgrades their digicam. |
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#7 |
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Join Date: Aug 2002
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The instruction manual for the F717 lists the approximate number of images that can fit on various sizes of memory sticks, and it lists 188 full-size images for a 512 MS Pro. When I put in the blank stick, it says there are 194 left, so the stick apparently doesn't have any less capacity than Sony expects. The 194 is a conservative estimate, too: it assumes the pictures will average 2.4 megabytes each, but I've never actually seen one that large. Since jpgs vary in size, a memory stick almost always ends up holding more than the camera says at first. It makes sense to do it that way. It would be irritating for the stick to end up holding fewer images than expected.
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