How fast is "SanDisk Extreme Pro microSDXC UHS-I" that says the world's fastest microSD card?

The UHS-I standard compliant reading speed of up to 95 MB / s, writing speed of up to 90 MB / s realizes 4 K movie shooting microSD card "SanDisk Extreme Pro microSDXC UHS-I"How fast is the action camera"GoPro HERO 3"I shot a 4K movie or copied the shooting data and tried to thoroughly check the reading speed and writing speed of" the world's fastest microSD ".

SanDisk Extreme Pro microSDHC ™ / microSDXC ™ UHS-I Card
http://www.sandisk.co.jp/products/memory-cards/microsd/extreme-pro-uhs-i/

◆Appearance check
This is the SanDisk Extreme Pro microSDXC UHS-I card. Extreme Pro series is familiar red × black design.UHSSupports speed class 3 and SD speed CLASS 10.


It's a microSD card so small size it can be placed on your fingers. There are three types of capacity, 16GB, 32GB, and 64GB.


The back is green.


Of course it is OK to convert to full size SD card with adapter.


◆4K movie shooting
In order to ascertain the performance of the world's fastest with microSD card size, try to shoot a 4K movie with GoPro HERO 3. First of all, insert it in GoPro HERO 3 and format it.


When I photographed how to cycling a riverbed with GoPro HERO 3, there were no dropped frames due to insufficient transfer speed. The bottom movie is part of it, and you can watch at 4K resolution by selecting "2160p" in "Settings" on YouTube.

Try the 4K movie with Extreme Pro microSD + GoPro HERO 3 - YouTube


GoPro HERO 3 has a 4K movie shooting function, but if you are worried that you can not fully demonstrate its performance because there is no microSD card that can write data stably, Extreme Pro microSDXC UHS - There seems to be no need to worry about taking movies.

◆Benchmark measurement
When shooting with GoPro HERO 3 for about 6 minutes, the size of the video data became about 2 GB. As expected, the size of the 4K movie is huge. In this stateCrystalDiskMarkIt is like this when taking a benchmark with. The result of 86.35 MB / s for sequential read and 77.20 MB / s for sequential write does not correspond to the maximum speed of the spec sheet (95 MB / s · 90 MB / s each), but it is quite fast as SD card.


Furthermore, measuring the benchmark of ADATA's CLASS 10 compatible microSD card looks like this. Extreme Pro microSDXC UHS-I is differentiated by nearly 15 times at the speed of sequential writing. Of course, even with 4 card movies taken with GoPro HERO 3 on this card, frame dropping will occur.


For your information, the usual SD card size "SanDisk Extreme Pro SDHC UHS-IThe speed is as follows. Compared with the previous result, it is clear that Extreme Pro microSDXC UHS-I realizes speed comparable to full size SD card with microSD card size.


◆File transfer rate measurement
· Data transfer to PC
Next, the speed of copying about 2 GB of 4 K movie data shot with GoPro HERO 3 to the desktop of Windows 7 / PC is called "Transfer speed measurement"Was used to measure.


The result of 8 measurements is 674.59 Mbps (84.32 MB / s) at 675.51 Mbps, 675.13 Mbps, 674.05 Mbps, 673.78 Mbps, 675.24 Mbps, 673.81 Mbps, 676.16 Mbps, 668.44 Mbps, was.


· Data transfer from PC
Conversely, I tried copying about 2 GB of data on the PC to SanDisk Extreme Pro microSDXC UHS-I.


The result of 8 measurements is 559.26 Mbps (69.91 MB / s) for 6 times that cut the top and bottom at 542.74 Mbps, 558.82 Mbps, 559.15 Mbps, 558.48 Mbps, 568.17 Mbps, 560.06 Mbps, 559.37 Mbps, 559.69 Mbps, .


For reference, if you measure the transfer speed with the CLASS 10 compatible microSD card that measured the benchmark earlier, the copy to the PC is 159.09 Mbps (19.87 MB / s), the copy to the microSD card is 45.28 Mbps (5.66 MB / s ) Result was obtained. Since the processing time for writing about 2 GB of data to the microSD card exceeds 6 minutes, it is not practical to deal with large data such as 4 K movies with SD card with slow sequential write speed It looks like it.


"SanDisk Extreme Pro microSDXC UHS-I" achieved the same speed as the high-spec model of the full-size SD card, and it was the performance as touched as "the world's fastest microSD card". It seems that if you shoot 4K movies using GoPro HERO 3 or take pictures with high-speed continuous shooting with smartphones equipped with microSD card slot, it seems to be said to be a media card that will be very useful.

SanDisk Extreme Pro microSDXC UHS-I will be released in October 2014,Yodobashi.comAt 16 GB for 8200 yen (tax included, 10% points reduction), 32 GB accepts 13,820 yen (tax included, 10% points reduction), 64 GB accepts reservations with 27 thousand yen (tax included, 10% points reduction). Both models come with an indefinite guarantee.