Thanks for the alternate solution. The external hard drives are 1-WD My book Studio 1TB, 2-WD My Passport 2TB, 1- Seagate 2TB. The MyBookStudio is the oldest. Two of these I'm accessing regularly albeit annoyingly as I have to unplug the HD I work from to plug in the HD with Time Machine a couple times a day or so for backups. The other two I access less frequently for work and personal file storage. Would a USB3 Powered Hub be slow for the HDs I'm using frequently?
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The apple thunderbolt adapter goes the wrong way unless I'm not seeing one.?