Gigastone 32GB 5-Pack Micro SD Card, Full HD Video, Surveillance Security Cam Action Camera Drone, 90MB/s Micro SDHC UHS-I U1 C10 Class 10

The usb adapter used on these will make a big difference in speed. I first tested this card with a USB 2 adapter which brought read speeds of around 20MB/s. Pretty good but not near the 90MB/s claimed. But when I switched to a new USB 3 mSD card adapter, the average read jumped up to an average of 68MB/s. There are a lot of environmental variables that go into the actual achievable speeds of a bus attached device....Android is always terribly slow at exporting data. Windows depends on system load, drivers, and specific chipsets so I didn't expect this big of a boost. ALL mSD CARDS ARE FRAGILE. HANDLE WITH CARE. THEY BREAK EASILY. If your speeds are low, then usually it's a system issue. On usb2, you should get 10-20MB/s. On USB 3, you could get 70-80MB/s. Linux always gets data transfer closer to the theoretical maximum data throughput. Windows, you're good to get half, and Android, well, get a cup of coffee and watch the football game while you wait for pictures to be transferred. Because of the way storage is arranged by the Industry Standard, you'll have 14.6G available on this card. Some blocks are reserved for file system data and some are reserved to replace blocks that go bad. This is normal but keep in mind to get a larger card if you have a minimal storage need of 16G.

I bought this 5 pack because it seemed like a great value, but when I used them in my Raspberry Pi and did a software update, some update files ended up reporting data corruption or lost data. My 32GB Samsung cards had no problem, nor did my 8Gb Transcend. I did retry the first Gigastone card twice, then I tried a second card from the order with the same results.

I had a shorting issue with my 3D printer ruining SD cards. (finally found the short and fixed it). Not wanting to keep wasting money on high-brand-name cards, I ordered these Gigastone SD cards. They work great so far. No issues. I installed the controlling software for the 3D printer easily and it is now working again - yay.I also put two inside of my security cameras and two more in my 3D printer monitoring cameras. All five cards are working great with no issue in any device.What really surprised me was that these came with a USB-to-microSD reader. I did not remember seeing that in the product description. This made setting up the 3D printer very easy and it makes working with the SD cards easier since the only reader I have is attached to my CAD/CAM computer. Now I can use the USB device to read SD cards on my laptop.Win-win for me.

I purchased the 5 x 64 GB package. I did a speed test in Linux using GNOME Disks and I was getting 90+ MB/s while doing a read-only test and 40+ MB/s while doing a read + write test. I was only able to achieve these speed using my Ankur USB 3.0 memory card reader. When using the included USB 2.0 adapter I was only reaching a little over 20 MB/s for both read and write. The performance and capacity was really good for the price.

After these 32 Gig cards arrived I decided to do a low level format on each of them just to make sure they all work. I'm sure glad I did that. While four of the cards formatted to their full capacity, one of them would not.I did a complete format on that one card three different times and it always gave me the same results. I reformatted a couple of the others more than once and they worked as expected each time. Just the one card out of the five appears to be busted.I also found that the same questionable card is not always recognized by Windows when it is initially plugged in. As a result, I've decided I'm going to toss that one. It is not worth sending them all back because of one faulty card but this purchase is not the bargain it once appeared to be.

Bought these for some outdoor wildlife cameras. Only paid about $22 for 5 of them so that's about $4.40 each. These are class 10 (about 90 MB/sec), so they work well for storing video and other high-speed data. Just started using them and they seem fine. I'll see what happens in a few months.

Using this for a cheap dash cam when trump supporters kept veering me off the road. Since the sore loser lost, these lunatics gradually calmed the hell down but this product works well in the camera so at least I am ready to call the police when it happens again and I have it recorded. Having a 5-pack means I won't fret about giving one to an officer to submit as evidence when I take these sore losers to court. I tell you, I hate sore losers, but I'm glad there are products like this to help me protect myself and my insurance claim if an actual accident is caused by their reckless attempts at murdering me.

I ordered these to install on security cameras and since have had 2 of the SD cards just stop working. The 2 SD cards will not format via windows operating system on a desktop pc nor via the security camera. I was happy with the product when it worked but to get a few months of use then it is definitely not worth the price. I also tried contacting the manufacturer via the links on Amazon but got zero response since they supposedly have a warranty on these for a year.

These cards are SDHC and are therefore perfect for “older” or simple devices that usually specify a 32gb limit.I use mine to carry my music collection for my car stereo. Due to the fact that the stereo will only index one thousand songs at a time, these cards are perfect as they will store a thousand songs at 320kps quality with the greatest of ease. Therefore one order of these cards will give you ample storage to have 4000 high quality songs that are accessible to every device that you might have.If you couple these to a good USB adapter then you really do have true “go anywhere” music.

40% of these came defective. Can't write to them using my RPi Imager. Etcher chokes on them. DD via the CLI errors out. I didn't check all of them when I received them, so I missed the window to return them. Don't make the same mistake I did. Make sure you try writing to all of them when you get them - this seems to be a common trend for a LOT of SD cards these days, not just these ones.

time will tell

It's not easy to find reasonably priced smaller capacity SD cards for older electronics. These were just right for our Photo Frames though and are reasonably priced.

I would recommend these packs of SD cards as a quick & efficient way of moving around your memories to different devices.