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In Reply to: Need Dumbed down advice on HD backup for Mini system posted by farmdoc on October 22, 2014 at 11:10:51:
It is best to keep the external HD from which you play your music away from the USB bus used by your USB DAC. The easiest way to do that is to use a Firewire or Thunderbolt HD. if you are worried about availability of Firewire down the road, you can get a HD that can use Firewire or USB or maybe you can find HDs that can do Thunderbolt or USB. This is the simple answer.
The complicated part is if you really want to use a USB HD. Then you should make sure you use a USB port that is on a different USB bus than your DAC. The USB bus controls the exchange of data between the USB ports and the rest of the computer. The problem is that multiple USB ports can use the same bus and some of those ports are internal, such as for the Bluetooth controller in your computer. The way to check this is to click on the Apple menu at the upper left of your screen and then select "About this Mac". When that window comes up, click on the "More Info..." button. When the next screen comes up, click on the "System Report" button. In the window that comes up you will see the word "Hardware" at the top left (you may have to scroll to see it). Click the twisty to the left of "Hardware", if necessary, to show the hardware categories. One of those categories will be "USB". Click this and it will show you your USB busses and the devices using them. Try plugging your DAC into different USB ports until you get it onto a high speed USB bus that has no other devices on it. You may have to move other devices (including your external USB HD) to other USB ports to achieve this. If you have to, you might decide to put the DAC on a bus shared with the Bluetooth controller and then go to the System Preferences to turn off Bluetooth, so that it will not create activity on the bus.
This process of getting your DAC on its own, non-shared USB bus should be done whether or not you use an USB external HD. It is just easier to do without an USB HD.
It really does not matter where/how you connect the HD you use to back up your music, as long as you ONLY connect it while you are actually backing up, which you only need to do when you acquire new music.
Cheers,
Bill
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