SANDISK 512GB Ultra Dual Drive Luxe USB Type-C - Up to 400MB/s - SDDDC4-512G-GAM46

This USB drive features both USB A and USB C connectors, making it compatible with older and newer devices. The speed and storage capacity is also good, the drives comes in a variety of different storage sizes. The USB drive is easy to connect and remove and has included software functionality that makes it easy to back up and restore data. The metal construction also provides durability so the drive can last a long time. The drive does run hot when transferring a large amount of data, so this should be kept in mind. When formatted for APFS on macOS, the speed increases tremendously, as APFS is a modern filesystem that is designed for flash and solid state storage devices. The speed slows when the drive is formatted for NTFS and exFAT.

Works good but gets hot. I wrote the same thing on a different one I bought and I still don't know if it's good or not but if I'm doing a real big file transfer and speed slows down I take some canned air upside down and give it a couple squirts of CO2 and the speed picks back up. I've had it for over a year and moved a lot of files and it still works.

I bought this drive to transfer and store files from my phone and laptop. It works well, the transfer speed is good, and the dual connector makes it very convenient. The size is compact and easy to carry anywhere. So far everything works as expected and I am happy with the purchase.

I bought a "Used - Like New" version of the 512GB 400MB/s model during the Prime Day sale, for use as a portable backup of important data that I could take with me on my keychain. It was the perfect size and design for this use and also kind of cute. When I received it a few days later, it was just the drive, wrapped in bubble wrap in a plastic bag. No packaging, despite the description for "Used - Like New". But I decide to give it a shot anyway, as I didn't really need the packaging, and if the drive was good, that's what really mattered. But it wasn't. It SO wasn't. Easily the worst flash drive, and one of the worst tech products, I've ever used. After I formatted it using ExFAT, then encrypting it using VeraCrypt, which I've done with every flash drive I've owned that I used to carry important files with me on my keychain, it took me literally days to copy over around 400GB of data. It often basically froze, and made my reasonably powerful PC grind to a halt, and I had to stop, wait and restart the copy process, over several days, to complete it. Then, once all the data had been copied over, syncing files from my PC to it took much, much longer than it should have. The drive was clearly junk and going back, both because the description was misleading, and because it was essentially defective. But the Prime Day sale was still going on so I decided to give it another shot, and ordered another "Used - Like New" version. When I got it several days later, it came with the original packaging, opened of course. But the drive was unformatted, and seemingly unused. So I formatted and encrypted it, as before, and proceeded to copy over the same data as before. Only now, instead of days, it took just a couple of hours, if that. I mean it was fairly fast. Not blazing fast, averaging around 50MB/s, which was quite decent for a drive this relatively inexpensive, but fast enough for my needs. The way I intend to use it, to sync my PC data to it before leaving home each day, which is usually no more than several MB of new or changed data, it's plenty fast, and every time I sync it, it only takes a few seconds. So it's hit or miss with this drive. The difference, I found, is that in the hardware settings, the first drive didn't allow me to enable write caching, while the second one did. So either there are at least two different chipsets that come with this drive, or the first one's chipset was defective. So if you do get this drive, check for this, and if it doesn't allow write caching, then send it back, it's likely going to be ridiculously slow. But if it allows it, then keep it, you should be happy with it so long as you don't expect super fast write speeds. Update: Around a week in it's actually performing even better, with daily syncs taking from a few seconds to a minute or two, depending on how much data is being synced. I mainly use it to backup and sync my PC's most important data so I can always have a backup with me on my keychain (I have other backups of course and this is just additional insurance), and it's worked perfectly for this. I actually created 2 partitions on it. One that took up most of the drive, formatted in NTFS (which gave me around 10GB more capacity than when formatted in ExFAT) then encrypted in case I lose it, to store the backup. And one 8GB partition, formatted as ExFAT and unencrypted, to pop into my phone to backup data when I'm out all day. Works great for both. Update #2: I liked the 512GB drive so much that I ended up getting the 1TB version, as the 512GB one didn't have a lot of capacity left for future needs after I copied my most important data to it. I also expanded the smaller unencrypted partition to 64GB as I could easily spare the space with this much capacity. I then copied some additional data to the larger encrypted partition. I actually purchased several 1TB drives, fearing that I'd have the same issues I had with the first 512GB drive And, just as before, several turned out to be extremely and ridiculously slow, and they didn't support write caching, while thankfully one did support write caching and was much, much faster, as fast as the good 512GB drive. So I returned the slow ones and kept the fast one. It's not blazing fast, around 280/70MB/s read/write, but that's more than fast enough for my needs, and I much prefer its design and size over faster but bulkier drives. So bottom line, a pretty nice and reasonably fast drive, IF you get the one that allows write caching, but an absolutely and horrifically terrible drive if you get the one that doesn't. Another way to tell which is which is that the good 512GB version has only 460GB capacity and the good 1TB version has only 920GB, while the bad 512GB version has 466GB and the 1TB version has 931GB. Also, the good ones were made in Malaysia and the bad ones in Taiwan (the country is printed on the drive).

This thing is a rocket on my M4 Macbook Air. I use it as a backup for photos, which are stored on the laptop from the camera card every night and then backed up to a couple of these drives just for insurance. This one is noticeably faster than any of the other ones I've used in this role before, and is the one I'll now turn to if I need to move a large amount of data between two of my machines. (I have it formatted as EXFAT so I can move things between Mac and Windows if necessary.) I would certainly recommend it to others, and probably will get another one because it's so fast. It does get hot in use. Not enough to burn you, but enough to surprise you if you're not expecting it.

I have purchased several hundred USB drives over the last decade or more. These have been the best ones I've ever owned. They are built well, perform well, and are equipped with both USB-C and USB-A connectors, making them usable in almost every situation. I have purchased dozens of these drives, and I couldn't be happier.

There are currently well over two thousand 1 and 2 star reviews. Believe them! Also be aware that an official "Frequently returned item" warning has been added by Amazon near the top of the page. Believe it also. Take it from someone with many years of IT experience working with storage devices, the write performance of this flash drive is so bad as to make it unuseable for all practical purposes. There are already quite a few reviews including test result pics. Take note that essentially all of the more recent ones (i.e. for currently shipping versions of these flash drives) show random write speeds of nearly zero. Yes, that's correct, the random write speeds are so slow as to be barely measureable. Indeed, they are so slow that sometimes the test will timeout because it is taking too long to complete. If you're not a techy or don't have any idea what most of the above means, let me put it this way... the majority of the time when writing (aka saving) multiple files to this flash drive, it will a) take MUCH MUCH longer than other similar flash drives and b) these become so slow and unresponsive that, for all practical purposes, the drive can't be used for anything else concurrently. In other words, you can't use the drive for anything else. Real world example, if I try to merely browse through the contents of the drive while writing files to it, it will literally take between 10-30 seconds just to open folders, which is something that should happen instantly! Obviously you can forget about using any of the files already stored on the drive (e.g. watching a video, viewing photos, etc) while files are being saved to it because the drive will become so extremely unresponsive. To those wondering how there can be a relatively high rating on this page, the answer is due to a) there being numerous different models and b) newer versions being drastically worse than older ones. I suspect this is yet another example of a company cutting costs at the expense of product quality. Even more disappointing are the reviews talking about how they've contacted SanDisk support who acts like they're the only person to ever report a problem. Which is obviously in direct contradiction to the 2000+ 1 and 2 star reviews here, not to mention all the others posted elsewhere. As a result, I cannot recommend this due to epic failures of both the product itslef and the product support. If SanDisk ever does right by me and provides a no cost replacement (since it's under warranty) that performs properly, I will absolutely update this review. If you don't see an update then be assured because SanDisk didn't resolve the problem.

seems pretty great so far - i did a speed test, included are the results. this speed test is on a 5Gbps USB3.1 Gen1 Type-A port on a Z-370 motherboard with an 8700K and 64GB DDR4 RAM (in case anyone was wondering) I realise the speeds will be lower in real workloads, and will as always, gradually go down over time. But, out the gate sequential speeds are faster than advertised, which is always great.

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The write speed isn't above 100mbs/sec while the read speed is good around 360mbs/sec.

Brilliant small usb for my PC & iPad. Good quality

Bonito y de gran calidad.

Stunning little piece of technology. Works like a charm. Very pleased with it. I'm waiting for stock to order another 1.