For all PC hard drives smaller than 2TB default sector size is 512 bytes. Only after disks went over this size manufacturers agreed to switch to 4096 Bytes. Those tools know about it - I did verified it before and after each operation with calculator (tool provides enough information
) resulting numbers where divisible by 64 and some small amount of "unused" space was left before or after each "new" partition if necessary.
I do agree with you however - reading info you pointed is a MUST!