SanDisk Ultra 64GB SDXC Memory Card, Up to 120 MB/s, Class 10, UHS-I, V10

Product Information

See Western Digital White Paper- Flash 101 and Flash Management. A detailed overview of flash and flash management (August 2018): documents.westerndigital.com/content/dam/doc-library/en_us/assets/public/western-digital/collateral/white-paper/white-paper-sandisk-flash101-management.pdf

Rated A1 3, the SanDisk Ultra® microSD™ card is optimized for apps usage. It delivers faster app launch and overall app usage performance that in turn provides a better smartphone experience. COVERAGE: The plan covers all defects & malfunctions under the original manufacturer’s warranty. The plan starts the day after the manufacturer’s warranty ends. It does not cover physical or liquid damage, accessories, consumables or parts that are not covered under the standard manufacturer’s warranty. Even for a single movie of 1.8 GB it took 2 minutes 30 sec by stopwatch to transfer. The write speeds started with 13 MB/sec and went down & down to 10-11 MB/sec. Even with my older Kingston DT elite 3.0 16GB,the write speeds were in excess of 21 MB/Sec. But For Example, If you have decided that you won't use it on mobile phones or tablets because the fitting is too tight and you don't want to risk damage to this point which is primarily used for charging - then go ahead and format the pen drive for your laptop.HEATING: Even with just 10 minutes of use, you can touch and feel that the metal part of the pen drive is getting heated. But the performance of the drive has not got affected by the heat. This heating does not happen in WD external hard-disks and seems to be unique to small pen drives of various brands. if like most people you will be using this pen drive on laptops or other devices of friends or co-workers, then leave the existing FAT32 File System as it is.

It takes Forever - to transfer anything. Maybe I - misunderstood "Ultra" or somebody missed "Ultra-Slow" in the model tag line. SanDisk Ultra® microSDHC™ and microSDXC™ UHS-I cards are compatible with Android™ smartphones and tablets, Chromebooks, and Windows® laptops. Just insert the card to instantly increase available storage space—at a great value relative to alternatives. New Windows® convertible and ultra-light laptop users, in particular, who were accustomed to the multiple terabytes of storage common on larger laptops will appreciate cards enabling more private physical storage. Finally with every passing minute it became all the more unbearable and annoying. Even in NTFS format speeds were the same.BEWARE that if the pen drive has NTFS File System then it won't work with mobile phones, tablets, laptops which don't have Windows Operating System. Same way, if you format the pen drive for Linux OS File System, it won't be recognised on Windows laptops, Android phones, tablets, etc. FILE SYSTEM FORMATTING THE PEN DRIVE: Unless you are sure you won't use your pen drive on a particular device, don't format the pen drive to change its FAT32 File System. I admit I have a USB 2.0 port at my laptop yet I was never used to such low speeds ever. The tagline “Ultra” and mentioned speeds of 130 MB/sec (which I suppose is the rated max. speeds at USB 3.0 ports) felt like a dream and beyond exaggeration. STORAGE SPACE: Just as in external hard-disk drives, the actual usable storage space will be less than what is mentioned on the product.

The device comes with the title “SanDisk Ultra - Dual Drive m3.0” and is the newer 2017 version of its previous iteration. Here I need to quote that the term “Ultra” came quite as a surprise to me as I found nothing in lines with a common understanding of Ultra. We will discuss it in detail in upcoming columns of speed.With a micro-USB connector on one end and a USB 3.0 connector on the other, the drive lets you move content easily between your android phones, tablets (with micro USB ports only) or laptops. SanDisk is an Israeli-American manufacturer of flash memory products, including memory cards and readers, USB flash drives, and solid state drives. As of February 2015, it is the third-largest manufacturer of flash memory. Up to 150MB/s read speed, engineered with proprietary technology to reach speeds beyond UHS-I 104MB/s, require compatible devices capable of reaching such speed. Write speeds lower. Based on internal testing; performance may be lower depending on host device, interface, usage conditions, and other factors. 1MB=1,000,000 bytes.

A1 performance is 1500 read IOPS, 500 write IOPS. Based on internal testing. Results may vary based on host device, app type, and other factors. I had never expected it to be this slow in this modern era of 2018, thus finally I decided to return it but I suppose I will only get a replacement & not reversal. FIT & FINISH: Being equipped with a retractable mechanism & being too small, the drive is not so smooth to use & slide-in or out in a single shot and needs some getting used to but then most of the OTG drives are designed small and hence have some or the other odd way of conserving size. TOO TIGHT FOR PHONES: The pen drive is a tight fit on mobile phones & tablets - so be careful when pulling it out so as to not damage your phone - because this is also the charging point for your phone. If you feel that your phone is too tight for this pen drive, then it is best not to use it for phone data storage management.

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GB : This capacity seemed to offer a decent compromise between storage, price & future proofing as with modern mobile cameras photos and videos shot are mostly of high resolution and larger size.64 GB ensures that you won’t have to empty it out any sooner or on a regular basis. In Linux OS laptop the available storage space on this FAT32 pen drive is shown to be 61.5GB. So that's 4GB more than what Windows OS calculates using their NTFS File System. FREE APP: Memory Zone App for Android is bundled free in this pen drive. It is easy to install and doesn't take any Phone Permissions other than Storage Access. It is very useful App with easy user-interface. App takes 64MB storage space on Android Phones. Blazing transfer speeds lets you offload cards fast. Use with the SanDisk® MobileMate® USB 3.0 microSD™ card reader 6 to achieve up to 150MB/s speeds 2. Approximations: Results and Full HD (1920x1080) video support may vary based on host device, file attributes, and other factors.