I want to use Windows 7 to format a ~4 GB USB flash drive in the FAT32 file system. (I want to format it in FAT32, not NTFS.)
In Windows Explorer, I right-click the flash drive and click Format.
The Format dialog box appears [(A) below].
The allocation unit size is set to 4096 bytes when the dialog box opens, but when I open the pulldown menu [(B) below], I see that there are other choices.
When I click the Restore device defaults button, the allocation unit size is changed to "Default allocation size" [(C) below], although it fails to specify what the default allocation size actually is.
What allocation unit size should I use for this ~4 GB USB flash drive, and why?
Would the answer be different for a different capacity flash drive (~16, ~32, or ~64 GB, for example)?
(I want to be able to use the flash drive on both Windows and Mac, so I am choosing FAT32. I will be storing some mp3 on the flash drive.)