Delkin Devices64GB Power MicroSD UHS-II (V90) - 300MB/s Read, 250MB/s Write, for 8K, 4K, 3D, HDR, and 360 Video Recording | High-Performance for Cameras

I intend to use this micro SD card for the operating system of a streamer for digital music playback. The audio signal is passed through the streamer with Ethernet cable before reaching to a DAC for music play-back, aiming for eliminating the high-level noise through USB connection.I did experiments by comparing this card, another UHS-II v90 available at the time when this card was purchased, with two other branded name UHS-I v30, as well as a super cheap option as well, at UHs-I v30. Among the five cards tested, this one perform the best - great dynamics, very rich sounds without losing the details, and very musical as well for acoustic sound music such as classical and jazz. No harsh sound at all for the high frequency signals. The other v90 gives more details but sounds a bit thin. The no-name brand and one of the name branded v30 performed not too bad, but noticeable inferior to the sound coming from here. But one of the famous brands sounded the harshest and congested. Of course, like any other audio system, the equipment performance is very much system-dependent. What I am trying to say here is that micro SD cards does make difference in performance of sound, and Delkin’s UHS-II v90 indeed makes a very positive impact on sound quality.A couple of days ago, the streamer I used started to slow in response, and sometimes, even made statics noise. The streamer also failed to reboot. I took this card out and try to reimage the operating system on it again. I tried to do a high security reformat and clean using an Apple Mackbook. Unfortunately, the cleaning process failed at the 7th step. It states that certain blocks of the card cannot be reformatted. So likely the card is dead. I checked that I bought it from last May, so it lasted not quite a year. It should be noted the last one prior to this card I used for the streaming purpose was from a major brand-name. It lasted three years without any issue.I am really struggling if I should buy another one because the most economic one available is $82.Update after about a month later: I noticed from the package image posted by others that Delkin provides lifetime warranty of the products they sell. So I wrote to Delkin customer service and got response the second day. They asked me to send the images of the product i bought in together with the original purchase paperwork. They used the second-day UPS delivery for the delivery of the replacement and requested the return of the original purchased item, a first-rate customer service in my opinion.So Delking Micro-SD card offer the excellent functional performance, backed by the first-rated customer service. Rest assure if there could be some quality issue, backed by Delkin’s lifetime warranty of the product.I also change the rating from 3.5 to 5 now.

I got these on special, making them a great deal. They record at the fastest speed currently available for drone filming, and the GB storage is decent, making it one of the better choices I’ve been able to find recently. Most suppliers are out of stock / back ordered on what I really wanted.

Excellent SD card for GoPro 10 In all of its settings. No Freeze, no corrupted files. Had some trouble with SanDisk extreme pro, but.non with this.Expensive but worth your money.

I have been flying drones for 10 years and I have used MicoSD cards since 2013.This card is an absolute garbage.It works well when I put it into the drone but once I turn the drone off and on to change the battery, the card is unable to write again. All I see is a spinning circle on the drone's monitor and no more recording.No matter how many times I format the card, I keep running into the same issue again and again, after one flight, no more recording is possible. Never had this issue with any of the SanDisk cards I used and own. Run from this card as fast as you can . Do not buy it.

This card is very fast, tested on PC via Card reader (direct) and USB card reader. It stands its declared speed, but could be cheaper too.Its reliability will be proven over time, so I might update this review.

I like the fact that this works fast but I need higher storage capacity options.

its reads fast my 4k 60 and 8 k video still dark at evening but its decent

This card is great for the Insta360 One R camera or for the DJI Mavic Pro 2 or DJI Air 2