To try out the SanDisk Extreme microSDXC 64GB memory card we will us using the SuperSpeed USB 3.0 interface on the ASUS Zenbook Priime UX31A. We used Intel USB 3.0 driver version 188.8.131.52 for testing. This Intel Ultrabook comes with a built-in SD card reader, but it uses the USB 2.0 bus and doesn’t give us the performance we are looking for.
To get the best performance possible we used the Kingston MobileLite G3 card reader. This is an inexpensive multi-card reader that can be picked up for $11.58 with free shipping. We have a review on the Kingston MobileLite G3 here if you are interested in knowing more about that product.
CrystalDiskMark is a small benchmark utility for drives and enables rapid measurement of sequential and random read/write speeds. Note that CDM only supports Native Command Queuing (NCQ) with a queue depth of 32 (as noted) for the last listed benchmark score.
Benchmark Results: CrystalDiskMark showed that we hitting 95MB/s read and 61MB/s write on the sequential test! The SanDisk card is speed rated at 80MB/s read and 50MB/s write, so you can see we are well beyond those speeds here.
ATTO is one of the oldest drive benchmarks still being used today and is still very relevant.. ATTO measures transfers across a specific volume length. It measures raw transfer rates for both reads and writes and places the data into graphs that can be very easily interpreted. The test was run with the default runs of 0.5kb through 8192kb transfer sizes with the total length being 256mb.
Benchmark Results: The Sandisk 64GB SDXC card was able to reach 95MB/s read and 61MB/ write speeds in ATTO with the default benchmark settings.
Check Flash is a multi-purpose flash drive testing and maintenance tool. This utility allows for error checking, speed tests, and much more.
Benchmark Results: Check Flash took just over an hour to check the card for errors and none were discovered after scanning the entire card. The average read and write speeds observed by the utility were 85.70 MB/s read and 49.66 MB/s write.