Raspberry PI (RPI) USB Drive Performance

Several years ago I put a USB hard drive on my development RPI using procedures like this:

https://www.raspberrypi.org/forums/viewtopic.php?f=29&t=44177

I knew it helped, but not really to what extent.

Today, I had to upgrade the RPI from Wheezy to Jessie to Stretch. My SD card based RPIs took 1 long day or two 8 hour days to do the update.

The development RPI running the USB hard drive was upgraded in 1/2 a day, if even that.  Clearly the USB system is much faster.

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