Will this work in my Samsung galaxy s4 smart phone?

No, it wont. This is an SD card, it is too big. For smartphones you need a micro SD card. I have a Galaxy S4 and recently I got this: http://www.newegg.com/Product/Product.aspx?Item=N82E16820231651 I posted up a review, that you can read on the product review.

I plan to use this as extended storage for my mid-2012 retina MBP. Is this compatible?

I have a 2013 Retina MBP & it works fine. Should be no problem. I'm sure you know this already, but SD cards don't sit fully in the card reader slot in MBP's, meaning the card will protrude about 1/2" - 3/4" or so. Just be careful not to snag the card. Hope this helps.

Can I use this when a SDHC card is used?

Since SDHC came first, there may be comparability issues when trying to run a SDXC card. Please check your device manufactures support page for more information.

Will this product work in an ATECH XM-5U reader connected to the F_USB1/F_USB2 connectors on a GIGABYTE GA-EP45T-USB3P motherboard ?

If you are running XP and are unable to access this card, go get the exFAT extension from Microsoft. Will need Service Pack 3.

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ADATA ASDX64GUI1CL10-R Premier Pro 64GB SDHC Card

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Digital High-Capacity (SDHC)
64GB
Speed Class: Class 10

Overview

Specs

Reviews (3)

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Premier Pro Series SDXC/SDHC memory cards meet the latest SD 3.0 specifications for Ultra High Speed (UHS-I) transfer, with read/write speeds up to 95Mbps and 45Mbps. The high-speed read and write optimizes work for professional photographers, and allows for the enjoyment of full burst mode shooting. This solid, high efficiency, reliable and durable memory card meets the most stringent demands of professional photographers - and those who just love high-speed photography.

Premier Pro SDXC / SDHC UHS-I U1 Class 10 VS. SDHC Class 10 Super Comparison

Premier Pro SDXC UHS-I U1 Class 10 64GB and SDHC UHS-I U1 32GB capacity memory cards have high speed read/write rates: 95Mbps / 45Mbps, which is 350% faster than general Class 10 memory cards. The high speed fully meets the high demands of photography experts in high-speed continuous shooting and Full HD video recording.

High Durability

This remarkable transfer performance is combined with higher degrees of data protection, including: X-ray proof construction, resistance to extreme temperatures, error correcting code (ECC) and write-switch protection functions.

High Capacity

Premier Pro SDHC UHS-I memory cards are offered in 8GB, 16GB, 32GB and 64GB capacities. Premier Pro SDXC UHS-I U1 memory card have capacities up to 128GB, eliminating the need for changing the card during shooting. This allows for long-term use by professional photographers without worries about data loss, noise, or the need to lower the resolution of shot media.

Model
Brand	ADATA
Part	ASDX64GUI1CL10-R

Details
Type	Accessory
Specifications	Capacity: 64GB Standard: SDA 3.0 Dimensions: 1.26" x 0.95" x 0.08" Voltage: 2.70 V - 3.60 V Performance: Seq Read / Write rate up to 95/45 (MB/s) Random Read / Write: 1300 / 100 (IOPs) Certifications: FCC, CE, BSMI, VCCI Note: **Read / write speed based on ADATA internal testing; performance may be lower depending on host device. UHS Speed: Class 1 Speed Class: Class 10 Operating temperature: -25 degrees C (-13 degrees F) - 85 degrees C (185 degrees F)

Features
Compatibility	SLR / Full HD Camcorder / 3D Full HD Camcorder / Digital Camera
Features	High Durability High Capacity

Additional Information
First Listed on Newegg	June 27, 2012

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Limited Warranty period (parts): Lifetime
Limited Warranty period (labor): Lifetime
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Return for refund within: 30 days

Return for replacement within: 30 days

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ADATA ASDX64GUI1CL10-R Premier Pro 64GB SDHC Card

Learn more about the Detailed Specifications

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info

Item#: N82E16820211661

ADATA ASDX64GUI1CL10-R Premier Pro 64GB SDHC Card

Learn more about the Detailed Specifications

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info