SanDisk Extreme UHS-I microSDXC Card SDSDQX Review


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Closer Look: SanDisk Extreme UHS-I microSDXC

SanDisk Corporation produces the Extreme microSDXC UHS-I card featured in this review. The SanDisk Extreme microSDXC series is available in 16GB, 32GB, and 64GB capacities. Online retailers sell the 64GB version (SDSDQX-064G-U46A) for $99.99 (Amazon | Newegg).

The SanDisk SDSDQX kit comes with three items: the SanDisk Extreme microSDXC card, microSD/SDHC/SDXC-to-SD adapter, and plastic carry case. The 64GB version receives U1/UHS-I speed grade ratings.


By design, microSD cards are extremely small items that live up to their name, verging on difficult to handle. The SanDisk Extreme series measure 15mm long by 11mm tall (0.59″ x 0.43″).


The SanDisk Extreme UHS-I microSDXC memory card kit comes with a SD card adapter, which fits the bundled microSDXC card, or any other microSD/microSDHC memory card.


SDSDQX-064G-U46A Specifications

  • Form factor: microSDHC (16 GB and 32 GB), microSDXC (64 GB)
  • Available capacities: 16 GB, 32 GB, 64 GB
  • Performance/speed: Up to 80/50MB/s read/write speed (32 GB & 64 GB); Up to 80/30MB/s read/write speed (16 GB)
  • Card dimensions: 0.59 in x 0.43 in x 0.04 in (15 mm x 11 mm x 1.0 mm)
  • Operating temperature: -13ºF to 185ºF (-25ºC to 85 ºC)
  • Storage temperature: -40ºF to 185ºF (-40ºC to 85ºC)
  • Compatibility: Compatible with all microSDHC, microSDXC, microSDHC UHS-I, and microSDXC UHS-I supporting host devices


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