Best way to connect several hard disks

HI - since getting my new Mac Pro, I worked with two hard drives of 12 to promised Pegasus 2 Raid-5.  They have been great.  But my video player started to get crazy and so I bought two backup drives WD - 8 to, one to save the key on each PP2 files.  Unfortunately, it was too late to save the video player, as one of the bays failed.  Because it's Raid-5 and with the amazing and patient Vincent promise eSupport, I replaced the failed drive Bay and am now waiting while he rebuilds (if all goes well, without any loss of data).  Then it will get saved.

Until it became clear that a bad drive Bay was probably underlying computer freezing, loss of images in video playback, etc., I was wondering if there was some sort of best practices for fixing of external drives.  With Thunderbolt, you can chain; But what to what?  Is there a limit any?  Can I plug two disks promise, then the one closest to you on the computer?  Must the WDs be connected in the same way, each to each, and the other to the computer?  Should there be just a Garland of four disks?   ????   In the old days, you had to look at how much energy was used during the USB and Firewire connection, but the true even for love at first sight?

Surely you'd be recognizing any indication on how best to connect several hard disks.

Thank you!

There are 3 unique bus in the Mac Pro black cylinder. Better reactivity is with your readers spread between three buses, keeping in mind that video display takes nearly half a ThunderBolt Bus itself.

You can use USB-3 for your backup drives - just keep in mind, it is only a sufficient bandwidth behind the USB to operate a chain of reading and writing of full tilt. If you simultaneously use devices more than that, you can start to see some cuts of your maximum transfer rate.

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