Memory Capacity for USB Flash Drive In The Industry
256MB comes with usable storage space of 238MB.
Explanation on the capacity " loss" :
1. 256MB on product is named in terms of decimal (base 10) capacity, which 1MB=1000KB, 1KB=1000B; while in binary numbering system, 1MB=1024KB, 1KB=1024B. So in theory, 256MB on product shall equal to 244MB in binary numbering system.
(Formula: 256*1000*1000/1024/1024 = 244)
2. Part of capacity is used for formatting, so is not available for data storage.