Just run something like the BlackMagic speed test or similar on it before deciding it is a good drive to use for installs. Lexmark or Lexar maybe?) Target sells are pathetically slow (something like 1.5-2MBps, compared to a fast USB stick running at ~200+MBps), and I'm sure they aren't alone. The $10/2 8GB USB sticks (I forget which brand. I'm definitely making a USB disk if/when I move to the El Capitan. Useful for troubleshooting if you really need it, but it takes a lonnnnnng time to boot from that disc. I used an equivalent process to the one described here to create a Mavericks DVD, with no USB intermediary. I've even heard of success stories involving making the USB media then burning the partition itself to a double-layer DVD disc - and thus having a bootable optical disc version for your older Macs.
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