Samsung BAR (METAL) 64GB USB 3.0 Drive

It's gonna be a long review, but in the end it came broken, as it was used only about couple of times, certainly not reliable, hot and slow write speeds (~300 KB/s). I would give -1 star (NEGATIVE) if possible. I spent a lot of time looking for a great choice of fast and reliable USB 3.0 flash drive, but looks like I indeed wasted my time and money completely. I choose the Samsung 64GB Bar flash drive because it looked solid (water/shock/magnet/temperature/xray proof), "claimed 5 year warranty", transfer speeds supposed up to 150MB/s with modern and clean design. After I received the flash drive, I went right away and made some benchmark tests with different file systems and transferring different file sizes/types. Here what I got in the first day/try of usage: Samsung Flash 64GB Benchmark - 01/08/2017 - Macbook Air 13 Mid 2011 - mac OS X 10.8.5 =============== USB2.0 - ExFAT Write folder (7 big files being total 2,84GB) to FLASH DRIVE - 2m48s (max speed avg 9 MB/s to 15 MB/s) Read folder (7 big files being total 2,84GB) from FLASH DRIVE - 1m18s (max speed 35 MB/s most of time) Write folder (391 JPG files with 2MB each) to FLASH DRIVE - 1m (speed avg 5 MB/s to 23 MB/s, cycle peaking) Read folder (391 JPG files with 2MB each) from FLASH DRIVE - 29s (max speed 31,5 MB/s almost 100% constant) Write folder (9,05GB movie file 720p) to FLASH DRIVE - 8m4s (speed avg 5 MB/s, 15 MB/s, 29 MB/s, cycle peaking each sec) Read folder (9,05GB movie file 720p) from FLASH DRIVE - 5m7s (max speed 34,9 ~ 35,2 MB/s almost until 50% constant, started peaking from 12MB/s to 27MB/s) =============== =============== USB2.0 - MAC OS - NTFS Write folder (7 big files being total 2,84GB) to FLASH DRIVE - 2m47s77 (max speed avg 22 / 22,5 / 17,5 / 8 / 3,5 MB/s cycles) Read folder (7 big files being total 2,84GB) from FLASH DRIVE - 1m28s (max speed 33 MB/s most of time) Write folder (391 JPG files with 2MB each) to FLASH DRIVE - 1m17s (speed avg 5 MB/s to 23 MB/s, cycle peaking) Read folder (391 JPG files with 2MB each) from FLASH DRIVE - 28s85 (max speed 32,5 MB/s almost 99% constant) Write folder (9,05GB movie file 720p) to FLASH DRIVE - 8m23s20 (speed avg 9 MB/s, 17 MB/s, 28 MB/s, cycle peaking each sec) Read folder (9,05GB movie file 720p) from FLASH DRIVE - 4m25s36 (max speed 32,5 ~ 33 MB/s almost 100% constant) =============== In the end, ExFAT or NTFS on my USB 2.0 ports acted pretty much the same in terms of performance, so I decided to keep using NTFS as would probably be easier to also use it with other devices. The read speed was around 31MB/s (with max of 35MB/s) and it's not bad considering it's USB 2.0 limitations, but write speed from 9MB/s to average 23MB/s was not what I was expecting. Now, if this review ended here, I would have give 3 or 4 stars, because it was reasonable on USB 2.0 (https://superuser.com/questions/317217/whats-the-maximum-typical-speed-possible-with-a-usb2-0-drive ), but now here goes the disaster... Notice that my benchmark ended using only about 13GB of files, just around 20% of flash drive capacity. After couple of weeks, I needed to use the flash drive to make a 28GB backup from a Windows notebook. It was a real pain. I thought it would transfer in about 31 minutes (considering average write speeds of 15MB/s) and it took more than 5 HOURS. Don't need to mention that the flash drive was pretty hot to touch and I needed to improvise a cooler or it probably would have taken longer (or fail) to copy. After I finally managed to copy the files to flash drive, I tried to open them in another Windows computer and it was not possible, not in one, but in ANY other computer. It always gave a message saying like "You need to format this disk before using" and it would ONLY open on my first Macbook Air I initially formatted it. I've read other reviews here at Amazon stating the exact same issue, of not being able to access flash drive on other computers. Now even worse, using the only computer I can access the flash drive, my Macbook Air, it won't write files anymore. If I try to read a file from flash drive, it's reading as before on max average of 30MB/s, but it I try to write ANY file to it, it will take FOREVER, writing at 256 KB/s ~ 500 KB/s. A great way to remember how internet speed were way back 20 years, but nothing like the "150MB/s advertised transfer speed". Again, I'm not the alone, I've read other people having also this same KB/s write speed issue. I'm currently outside the US and I bet Samsung will just say I'm on my own or will simply copy and paste their automated message. When I went to their website to check warranty details, it says "Sorry... No service policy & warranty information for MUF-64BA/AM". It's very amateur for a company of a size like Samsung. I'm very disappointed with Samsung and will look else where next time looking for reliable flash drives.