[mosiniak]

... if you connect a common SE or LVD SCSI disk to a HVD controller you will fry it...

If You connect LVD drive You will destroy it, but if You connect SE drive to HVD controller or vice versa You probably will not fry (I havn't tested that) anything.
In the 007-1732-060 page 46 You can read:

• If you plug a single-ended drive into a bus configured for differential operation, nothing on the bus will work.
  
• If you plug a differential drive into a bus configured as single-ended, the differential drive will not work. Single-ended drives on the bus may continue to work.
  
• Configuration jumpers at the IO4, drive rack backplane, and the sled board must all be set for the same mode or the bus will not work.
  

One more important thing:

• Never use a single-ended SCSI terminator on a differential channel. Connecting a single-ended terminator to a differential channelwill short +5 V directly to ground, resulting in blown fuses and possible equipment damage.