Vansuny USB 3.2 Flash Drive 128GB, 400MB/s Super Speed Flash Drive, USB 3.2 Gen 2 Solid State Drive, Retractable Thumb Drive Portable Metal USB Memory Stick for PC Laptop

UPDATE: I originally said I was only getting half the rated speed from the drive. I couldn't figure out why writing to the drive was faster than reading. I decided that maybe it was corporate software installed on my system, so I repeated the CrystalDiskMark from my personal Laptop (Ivy Bridge era Thinkpad, Windows 10) and got much much faster speeds, both in reading and writing. I don't know if the tests are the same, but you can see a dramatic difference. It appears that the USB speed on my workstation is limited by the controller. I have updated my score to give it 5 stars.Original ReviewReceived the 64 GB flash drive today. It states (on the 64 GB drive version) that read speed is 400 MB, sec. I'm getting 170 MB/sec maximum. Curiously, I'm getting 213 MB/sec max write speed. It is the fastest writing (not reading overall. It is faster with random reads)) flash drive I have, but it's half of the rated read speed. Writing being faster than reading is curious. Is it using some type of ram buffer on-board?My computer (ThinkStation workstation running Windows 7) is USB 3.0 only (so theoretical max speed of 600 MB/sec). I have ensured it is plugged into a USB 3.0 port on the back of the machine. I've tested the drive empty and then after putting about 10 GB of files on it. With a 4 GB archive and a 4GB folder of about 1200 files, the transfer speeds were very fast (peaking above 200 MB / sec).Considering that I'm using this on a workstation that isn't connected to the internet to transfer files, I can live with questionable durability. I need something that is fast that won't corrupt my data over about a 20 minute time period. But I'm sticking to my name-brand USB 3.0 drives for data that I want to carry around with me regularly. It's too suspicious that write speeds are greater than read speeds, and the read speed is less than half of advertised.

Honestly, i was waiting to get scammed on this one. Like some horror story you hear where you get fake memory sticks with fake capacities/speeds for really cheap. But no, not this one.For some reason, i bought two of them. And yes, i did pay for both, i saw the invoice and i bought two 128 GB ones, but i only wanted one... oops?.The first thing i did when i got them is use H2testw to see how badly i was scammed... and surprisingly, the full capacity was available for reads and writes! And HELLUVA fast too! 260 Mbps sustained read and 160 Mbps sustained write, on the H2testw software is really nothing to scoff at. Yes, it's lower numbers than advertised, but as usual i bet those are peak numbers and you can reach them in certain tests, but this is a full drive read and write. Not bad!For science, i opened one of my drives. I expected something a lot worse, but what i found was a flash UFS chip, the same ones that are used on mid to high end phones. I still don't think these things will last that long, the flash chip itself was partially lasered out so you cannot know which model the NAND is (but it was done badly enough that i could find it is a Sandisk UFS chip, model SDINDDH6-128G), but i bet these are NAND rejects that couldn't reach temperature or speed goals (hence the obfuscation effort) but still, it is not truly bottom of the barrel NAND like on truly cheapo commodity flash drives. It also has a decent UFS to USB controller (JMS901) so yes, you are definitely getting performance out of these.Only time will tell if they're as long lasting, but speed and capacity wise, these are awesome!

As an embedded systems designer I was skeptical that the 256GB VANSUNY Super Speed USB Flash Drive would actually operate as advertised. However after a few days of testing and real world use I've found that indeed it does.For those who don't want the technical details, just know that the 400 MB/s read and write speeds are real, the device is no wider than a typical USB thumb drive, it does not get excessively warm or hot, and it is fully bootable with both Windows and Linux.Now here are the details. This device is indeed an SSD, and utilizes a JMicron SATA/USB interface to allow it to operate as a thumb drive. It appears to have a 10 GB cache that allows it to achieve the rated 400 MB/s read/write speeds for smaller files, and after 10 GB it achieves consistent 360 MB/s read and 160 MB/s write speeds. This is quite good, and in line with other low cost SSD drives.I tested the unit with 10 reads and writes of 80 GB files utilizing a Sabrent 1TB Rocket NVME drive that achieves consistent 2000 MB/s read/write speeds. The VANSUNY drive barely got warm during the tests, and all files were transferred without error. After this I installed both Windows 10 Professional and then the latest Arch Linux and verified that the operating systems booted and operated on both physical hardware and virtual machines.Unfortunately I was unable to determine the other components utilized in the VANSUNY drive, so there's no way to know how reliable the drive will be for the long term, or how long it will last. However if I encounter quality issues in the future I will update this review.

UPDATE on 4/1/2024: It is now the end of March 2024, 1 year after purchase, and one has failed. It no longer writes without giving errors. I use it 10 or 12 times each year. I will buy one again to replace the defective one to see what happens. If it fails I will no longer recommend them.ORIGINAL REVIEW February 2023:I spent a little extra money because I wanted fast flash drives for backup. This is the fastest flash drive I have ever used -- literally twice as fast as anything else that I own. It will not disappoint.