Trying to lear of way to verify 1s and 0s written to newly formatted drive in iMac and 3rd gen Time Capsule

Question

after choosing format, initially, for Time Capsule, further chose to write 1s and 0s and I don't see either progress bar or any other indication process completed. Will lights blink differently? Is there other way to verify process completed?  Apple offers us the option to write zeros but without way of confirming they were written. I find this puzzling, at least.

Answer 1

after clicking on object representing TimeCapsule, a dialog box appears with menu tabs across top, last one being "Disks" and clicking that one shows device HD capacity, below which are buttons to Erase Disk... or Archive Disk...  Choosing Erase Disk... brings up verification dialog with drop down "Security Method" whose initial option is "Quick Erase (non-secure) then there is "zero out data" "7 pass erase" or "35 pass erase"
huge problem here is there is no apparent progress bar so it appears to be impossible to verify what if anything has been done, which makes each of the menu options other than "non-secure" as essentially meaningless