SanDisk SDSDUNC-128G-GZFIN Ultra SDXC Memory Card Up to 80 MB/s, Class 10, U1 FFP, 128 GB, Black/Grey

It does the business and is still working which is a bonus.

Good capacity on dash cam usage.

I don't know what the products either side of this in the range are like, but this was one compromise purchase that really didn't work. In fact I'd say it was pretty dire. Just about a complete waste of £12.50. Yeah, I know it's not much, but it's the cost of a pretty decent USB 3.0 stick of the same size, and one can just about get 64GB USB 3.0 for the same money. I would normally say that it's always worth having 32GB of portable storage around, so you haven't got nothing for your money, but in this case it really isn't.And I'll tell you why. In the first application (the one I originally bought it for), I got read speeds on 10MB/s and Write speeds of 2.5MB/s. This is far from the world's most modern machine (a Dell D420 ultralight) but the disk drive is doing 85 and 60MB/s R/W on a PATA backbone, and this performance really is terrible. The USB 2.0 on the same machine delivers 29MB/s and 15MB/s.This could be a poor implementation of SD, so lets take it to a better machine. One with PCIe 2.0, though still USB 2.0. (It has a USB 3.0 card which would give its absolute limitations, but I don't have an external SD card reader - and this card is not tempting me to buy one.) Again, though, the figures are poor, and nowhere near the 80MB/s printed on the product. They are 21 read and 15 write. The same USB stick from above gives us 35 and 18. These measurements are on the very same multicard reader on the front of an HP Workstation, so it can't be said that it is in an environment that is restricting it. This same machine is delivering 125MB/s to an external 2TB *mechanical* drive on its PCIE 2.0 bus. It does 275MB/s on just the SATA 2 bus. It's a snappy machine running Windows 10 64. There should be no excuse. This really isn't very good at all!If this SanDisk Ultra is anything, it's ultra bad. I am hard pushed to believe that it is capable of 80MB/s in any environment. That isn't in any case an especially high read target. In fact it's downright low. Is it a lie? I very much suspect so, and I may be tempted to spend money to prove it - if I haven't done most of the work already. Of course manufacturers will try to sell old technology to those who can't afford the latest, but the question is whether they will lie to do so? And is this indicative of exaggerations in the rest of the range? You have no way of knowing it isn't. And the USB stick I have been comparing this to here isn't some zippy product from the latest Samsung technology, but is in fact a Sandisk Ultrafit 16GB USB drive that cost £6.99, here on Amazon.Let's get one final thing straight, this is not a product that is going to be being bought by those people who have PCIe 3.0, six USB 3.0 ports, a 4th Gen i7, and card readers to match. Its promised market is exactly where I have pitched it, in legacy or near legacy hardware that remains powerful and functional today. In that environment this product utterly fails. Even if it can (just) meet the printed promise in pure oxygen, SanDisk are selling you down the river, probably because you are poor. My suspicion is that it can't meet its spec, in any reasonable circumstances, and that it should be taken off the market or sold at a quid a time, so that people know what they are getting. I'd rather have £12.50 than this product, and £12,500 for this review.

This one actually got ordered by error in a rush with the intention of purchasing a 64gb SanDisk micro SD,, not a standard SD lol. (Now you definitely know I'm reviewing honestly lol)....However, almost all of my SD cards are now older, slower types and classes and many are 32gb anyway, so I decided to keep it. I've done the usual benchmarking tests for read and write speeds of this class of card and it's fast, very fast!! I have stacks of different data cards from older larger compact flash to newer smaller SD and micro SD and one brand that has consistently outperformed and certainly outlasted many other brands repeatedly is SanDisk. I have SanDisk cards that are many years old that still work perfectly.They are frequently counterfeited however, so purchase from a seller with high feedback ratings. Even then, fakes are getting so good on the exterior now even the most diligent retailer can sometimes miss them if not paying attention. Make sure you benchmark any new card to check its performance that you have genuine goods. It takes seconds to test a new card and there are various programmes and apps to aid with benchmarking the basics, it's not a chore as it once was.Card was supplied in standard secure blister pack retail packaging. Performance is good which makes transferring files on and off less of a job than it used to be. Would definitely recommend SanDisk, for the price of their cards they perform very well and last longer than many other brands. I've never had a SanDisk micro SD fail on me out of countless cards and I can only recall one SanDisk SD card failing and I didn't exactly look after it particularly well.Would always happily recommend SanDisk for any type of data card. 5/5.

I've tried a lot of other brands in my Panasonic GX7 recently but over the last couple of months I had been using Integral cards, which had been great in my phone and Shield TV but for some reason I kept getting write errors on my camera. I didn't suspect the Integral card at first as up until now they'd been flawless, and two seperate cards seemed to be giving the same problems which seemed unlikely but I can confirm that after swapping the card for this one all my problems has vanished and the camera now operates perfectly. The integral should have had similar spec on paper to this Ultra card, but for some reason it's safe to say my camera much prefers the Sandisk. It's now operating flawlessly on operations that would previously have given me issue such as taking stills whilst recording HD video. With the Integral cards I would hit a "write error" message even hour or two during use, but now everything is absolutely flawless again. I've tested it significantly by swapping between the cards since and it is definite that for whatever reason the GX7 just didn't like the other cards. A nice problem to have solved as I had convinced myself it was the camera at fault.As usual with Prime this arrived next day. I had plumped for the frustration free packaging which was exactly as you'd expect. From now on any cards I buy for camera use will be Sandisk, although I'll continue to use other brands (which can be a fair bit cheaper, especially on larger sizes like 128gb) for other less demanding applications such as phone storage.