The shrinkage is all just Sales and Marketing ignoring engineering sensibilities in the quest for a bigger number on the box. The underlying storage cell arran

The shrinkage is all just Sales and Marketing ignoring engineering sensibilities in the quest for a bigger number on the box. The underlying storage cell arrangement is still (typically) 4096 bytes in size. (or 65536 (64KB) for many embedded devices). The device probably has about 10% of it's real storage capacity dedicated to ECC and other 'administrative' uses for provisioning the user facing storage.