SanDisk 128GB Ultra Flair USB 3.0 Flash Drive - SDCZ73-128G-AW46

music is therapy someone. I lost 30 to 40 GB of music I had accumulated over the last few years on my current phone. it was depressing and stressful, so it doesn't happen again. I bought myself this thumb drive to backup my music. it works perfect for that, it's just music. so for me it's writing about 50 MB per second and reading about the same amount. I watched lots of reviews but they were irrelevant. I only cared about backing up my music, so I always have it available in the near future. do yourself a favor and if you have music and pictures or other documents on your phone, get one of these. I like knowing that if my phone or to crash for some reason or stop working because it's past its life that I have my music backed up and start away on a thumb drive. so far I have only back the 10 GB onto the thumb drive and I still have at least a little over a hundred left so it's definitely doing its job. it's stainless steel I believe. so it's sturdy and it's not going to be carried around. mostly used to back up files and then store it in a safe spot. there is no cap to cover the USB portion of the thumb drive but it is very small and compact my first attempt I transferred 10 GB of music and it was cold to the touch. unlike other reviews floating the internet of people stating that it was getting hot. I'm actually thinking of purchasing another of the exact same capacity and gifting it so it can be used to backup a phone. it was less than $20 which was cheap in my opinion.