ReadyNAS nv+ v2 - factory reset after every restart, disks locked, erasing not finished after 6 days

At first I need to say that I read threads concerning same symptoms but still have no solution.

 

History:

Have ReadyNAS nv+ v2 worked well 6 years. Month ago got alert and decide to change disk #2. Backup all data, and replace Disk #2 with another, same model - but not new (worked at Synology NAS 1 yr ago)

 

At the same time I clean NAS (had dust inside).

 

Seems like disks was installed not at order, I try just to erase disks and apply factory reset - but not successfull - erasing tooks too much time.

 

So, now:

After any reboot NAS fall into factory reset, build one volume, report as good - but after next reboot repeat it again.

 

All disk - WD RED WD30EFRX

 

Yes, I know about erasing with RAIDar and did it several times with no results.

 

Last time I start it 6 days ago and now erasing still "in proccess",  not complited.

 

6 days!

 

So, have two questions:

 

1. What I should to do to erase all data and use my disks?

 

2. What I should to do in case if I want to connect those disks to my notebook via USB?