Peter to try to fix the busted USB drives try this: (from here:
3 Best Ways to Fix 'The Format Did Not Complete Successfully' Error - EaseUS)
"1. Fix 'the format did not complete successfully' by using Windows Disk Management
Unknown viruses on your computer may stop you formatting your disk drive in a large extent, so run a virus check using the security software at first attempt. Afterwards, try to format again in Disk Management carefully.
Step 1. Go to Run and type in diskmgmt.msc and press enter.
Step 2. Find your USB drive in the list and right-click on the disk and select "Format" option.
Step 3. Follow the format wizard to complete the format process.
Or you may perhaps delete the volume, create a new one and then format."