1TB Micro SD Card - Class 10 High Speed TF Flash Memory Card for Android, PC, Camera, Nintendo Switch & Security Cameras - Perfect for 4K Video Recording, Gaming & Home Surveillance Storage

This micro-SD card is marketed as a Class 10 card, which means it should be able to sustain write speeds > 10 MB/s, which isn't particularly fast by today's standards. While most manufactuers are overly 'optimistic' about read/write speeds, this card's performance is more than 3X class 10 standards, and it even exceeds U3 class requirements (write speeds> 30 Mb/s).In short, if you are looking for a 64Gb memory card with U3-style performance at a great price, this is a great coice! I would happily recommend this card to 99% of users. The only exception is for those who plan to record high-resolution, uncompressed 4K video (or similar). Otherwise, the card is a fantastic value!~Extended Review~To test memory cards, Disk Speed Test by Blackmagicdesign is used. For testing, I itteritevely incrase the transfer file sizes from 1 to 5 GB and perform a minimum of 3X tests per test. This acts as a stress test and can help identify shortcomings and/or caching issues. Although multiple tests are performed, I primarily focus on final Read/Write results. But please note that read/write speeds are often *better* for small transfers than what is reported below.Here are the results - also see attached pictures:*Maximum observed write speed = 59 MB/s, but only for a few moments.*Common (upper limit) of write sppeds = ~34 - 40 MB/s*Maximum observed wrtie speed = 89 - 90 MB/s (sustained/highly-stable)Transfer size (GB): Write Speed / Read Spped (MB/s)1Gb: 35.9 / 89.9 (MB/s)2Gb: 34.4 / 90 (MB/s)3Gb: 32.9 / 86.8 (MB/s)4Gb: 35.7 / 89.9 (MB/s)5Gb: 35.9 / 89.9 (MB/s)Misc. Details:Partition offset : 32 sectors (16384 bytes)Volume size : 122879968 sectors (62914543616 bytes)Bytes per sector : 512Bytes per cluster: 131072FAT offset : 16384 sectors (8388608 bytes)# FAT sectors : 16384