how can i connect disk to a computer without that happening ?
Simple answer is that you can't.
As Philip asks, why would you want to do this? Even if your disks were setup as RAID 1 you would need, 1) a USB/SATA adapter or caddy and 2) either an installable file system (IFS) or some software that can read the Ext2/3 file system that the disks are formatted with. Then, what you are doing is only recommended as a recovery measure if the unit has died and there is no backup.
Taking a disk out of a Linux based NAS box and allowing
ANY windows operating system direct access to it will destroy any data that it might contain. Linux file system and windows file system are totally incomparable and require an IFS or some other software to act as a translation layer between them.