Occasionally crashes/locks up but otherwise a great simple disk tester

Super easy to use. This worked well on my 2012 MBP on both Mavericks and Yosemite, and an older ~2010 MBP on Yosemite for testing my local HD and network HDs, including my Synology NAS. Results approximately match spec for the local HDs and match what the Synology registered locally for data throughput as well as a couple of other command line test tools. Occasionally crashed when quitting, or if I switched network interfaces from wifi to wired without closing the app first, while reading/writing to a network drive. (I understand this is a disk speed tester, but network is involved when writing to servers or NAS over the network, which it does fine. ) Sometimes would get hung in a really bad way and I’d have to reboot to clear it, but that was rare. For a free app, if you’re careful with how you quit it, it seems to work great.

benrobertsabq about Blackmagic Disk Speed Test