Any good sdcard testing/benchmarking apps out there?

[bladewriter]

Having installed a 64gb sdcard in my Bionic, I was wondering how the read/write speed compared to the 32gb. However,
none of the apps I can find in the market will properly recognize the /sdcard-ext, only the internal 8gb /sdcard.
I've tried AnTuTu (and emailed the dev about this), SD Tools, SD Card Tester. No joy. This has nothing to do with
the 64gb card as they won't handle my other microSDs either. Thoughts anyone?