sorry, none of your questions make any sense.
if you can only get 240MB/sec in a Lacie as Raid 0, just to get that
performance speed, it’s a little silly for many reasons.
1. raid 0 is combining two hd and if either fails, the whole thing fails.
2. price $420? what the…
alternatives: Seagate Backup Plus Fast 4TB Portable External Hard Drive 220 MB/sec $179
Western Digital My Passport Pro 233MB/sec $288
3. if you want redundacy, you need raid 1,5, or 1+0
if you are editing off your fusion, that’s a USB 2.0, super slow
your WD 8TB my book thunderbolt raid 1 would be slow.
in large-block random read and write, the My Book came in at 108.2MB/s
the WD My Book Thunderbolt Duo 8TB is $650 for 168-240 MB/sec raid 0 so, raid 1
will be very slow and raid 1 would lose half the space, so it would actually only be 4TB!
you shouldn’t store footage/video/editing cache on the same hd as your OS.