Issue description: Upon server crashing, and occasionally restarting, racks of drives disappear.

What happens: Disk drives get erased from racks, leaving players without items.

What you expected to happen: Drives to survive a crash or restart.

Steps to reproduce:

1. Set up RS system with drives
2. Crash server
   ...

Version (make sure you are on the latest version before reporting):

• Minecraft: 1.12.2
• Forge: 14.23.4.2759
• Refined Storage: 1.6.5

Does this issue occur on a server? [yes/no]
Yes

If a (crash)log is relevant for this issue, link it here:

[pastebin/gist/etc link here]

Duplicate #1846

You might be able to restore the disks with the /createdisk command although it might be difficult to determine who they belong to on a server.