If you are looking to reformat all of the HDDs from scratch, you should first understand some basic rules on how the DNS-343 treats HDDs and Standard Volumes:
- Once you format a HDD as a standard volume, you must leave the HDD in the slot in which it was originally formatted. For example, the DNS-343 will not recognize a HDD formatted in slot 2 that is moved to slot 3. There are some exceptions to this rule that get a bit complicated, so I won't explain unless the need arises later.
- Add HDDs sequentially starting from slot 1. You should not leave empty slots between HDDs.
If the HDDs are not formatting properly (i.e. hanging initialization), you can try mounting one of the HDDs in a PC and reformatting to remove any traces that may be impairing the DNS-343. You don't need to format all of the HDDs as standard volumes at the same time. You can start with one HDD in slot 1 (and leave slots 2,3,4 empty) and then add more HDDs later after the first HDD format is complete.