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. Benchmark Crystal Disk mark scores for a file transfer of 500 MB size were 34 MB/s -Read & 19 MB/s – write which looked like a mere consolation. Transfer between my Samsung S7 mobile & S2 tablet too was not fast. 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. 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 Full HD (1920x1080) video support may vary based upon host device, file attributes, and other factors. See: www.westerndigital.com/brand/sandisk/hd-video-definitions.

SanDisk Ultra is a brand of Western Digital which is the same company that sells external hard-disk storage devices under the brand WD Elements and WD Portable. SPEED: The Speed is extremely good for Windows OS laptop, Linux OS laptop and Android Mobile Phones.

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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. 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. 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. SAME AS OTHERS: For the 64GB pen drive, actual storage space available is 57.2GB. This is normal and not some fraud or fake advertisement. This is because it has FAT32 File System. Also, the device uses some space for its functionality and use. 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. 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. 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.STORAGE SPACE: Just as in external hard-disk drives, the actual usable storage space will be less than what is mentioned on the product.

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. It takes Forever - to transfer anything. Maybe I - misunderstood "Ultra" or somebody missed "Ultra-Slow" in the model tag line.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. STORAGE FORMAT: Since the previous FAT32 version had a limitation of file transfer size of a maximum of 4 GB for a single file & NTFS was not compatible with mac OS so with increasing file sizes ex FAT format was devised which doesn’t have a size limitation like FAT yet is compatible with Mac as well. So our drive has only ex FAT & NTFS formats to choose & comes in ex FAT by default with 128 KB file allocation size. Increasing the file allocation size may increase the transfer speeds a little but will affect the storage capacity little too. Changing it from 128 to 256 KB increased my write speeds from 13 MB/s to 15 MB/s if that’s a relief to anyone. Approximations: Results and Full HD (1920x1080) video support may vary based on host device, file attributes, and other factors. Finally with every passing minute it became all the more unbearable and annoying. Even in NTFS format speeds were the same.

MOBILE PHONES: The pen drive works with Android OS of Mi phones such as Redmi Note running Android including old Android Version 9 as well. With your Linux system's file format, you will have better storage space than any Windows File System. 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. 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.

Customer reviews

I know that read-write speeds depend upon a lot of factors including transferred file type, format configuration of drive, configuration of host & destination device etc.