Discussion in 'iOS Apps' started by Daniel97, Apr 16, 2012.

  1. Daniel97 macrumors 6502a

    Mar 6, 2011
    Anybody use dropbox?

    Ive just uploaded 91MB of photos to it on my Mac but it only shows 86MB on my iphone?

    Why is this?

    They are high res photos and i want the full file not a downsized version.

    All my options are set to keep original sizes so im stumped!?
  2. TJ61 macrumors 6502a

    Nov 16, 2011
    Have you actually looked at the pics after transfer to see if they been "downsized"? If they were, I'd be curious why only the ~5% difference in storage.

    I think it's MUCH more likely that the storage size reporting from two different systems is off by 5%, and that the pics are not downsized. But, like I said, you can check that.

  3. Menel macrumors 603


    Aug 4, 2011
    Don't know why file size discrepancy, could be a difference in file system structure on dropbox servers vs. Desktop.

    You can set photo options in app, low/med/high/original. You may prefer original, I do, I don't recall what default is.
  4. Qaanol macrumors 6502a

    Jun 21, 2010
    Mac OS X starting with 10.6 now reports file sizes uses standard SI prefixes. Therefore 1 MB is exactly 1,000,000 bytes, just like 1 MW is exactly 1,000,000 watts.

    Many other file systems still use the binary system, reporting values in MiB but calling them MB. In actuality, 1 MiB = 2^20 bytes = 1,048,567 bytes.

    Therefore, a file that takes up 91,000,000 bytes will be reported by Mac OS X to use 91 MB of space. But it will be reported by other systems to occupy 87.8 MiB, often calling the units “MB”.

    Furthermore, there may also be situations where Mac OS X reports the file size as a multiple of the file system block size, whereas web services like DropBox report the raw number of bytes in the file.
  5. Daniel97 thread starter macrumors 6502a

    Mar 6, 2011
    Every file is about 1-200kb smaller in DB than on the Dropbox folder on my mac?
  6. Qaanol macrumors 6502a

    Jun 21, 2010
    On your mac, select a file and Get Info. In the “Size” field you should see both the reported size of the file on disk (in KB/MB/GB, which will be a multiple of your file system’s block size, for me that’s 4 KB) and then in parentheses the exact number of bytes used for the file.

    If the file size is in the KB range, take the number of bytes and divide by (1,024). If the file size is in the MB range, instead divide by (1,024 * 1,024). If the file size is in the GB range, instead divide by (1,024 * 1,024 * 1,024).

    The result should agree with the size reported by Dropbox.

Share This Page