Q: my ipod touch is 4th gen 32gb but it tells me 27.8gb's remaining with 748mb's used where is the other 4.5 gb's gone?
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Jun 21, 2013 11:39 AMby lllaass,HelpfulThe blank, unformatted iPod as 32 decimal GB of storage.
From the aarticle
Storage device manufacturers measure capacity using the decimal system (base 10), so 1 gigabyte (GB) is calculated as exactly 1,000,000,000 bytes. The capacity of the storage media in your Mac (Mac OS X v10.5 or earlier), iPad, iPod, iPhone and other Apple hardware is measured using this decimal system. This is detailed on product packaging and online through the statement "1 GB = 1 billion bytes."
Capacity stated in Mac OS X or iOS
When you view the storage capacity of your Mac (Mac OS X v10.5 or earlier), iPod, iPhone, iPad, or other electronic devices within its operating system, the capacity is reported using the the binary system (base 2) of measurement. In binary, 1 GB is calculated as 1,073,741,824 bytes. This difference in how the decimal and binary numeral systems measure a GB is what causes a 32 GB storage device to appear as about 28 GB when detailed by its operating system, even though the storage device still has 32 billion bytes, as reported. You will see this difference if you look at how your computer summarizes the capacity of the computer’s storage, or of your iPod, iPad, or iPhone’s storage when the device is connected to your computer. You will also see this difference in the About menu on your iPod, iPad, or iPhone. The important point to understand is that the available storage capacity is the same no matter which system (decimal or binary) is used. Nothing is missing.
The storage media in your Apple product, like all storage devices, uses some of its capacity for formatting, so actual capacity available for applications and files will be less. In addition, other factors, such as pre-installed systems or other software and media, will also use part of the available storage capacity.
