Crucial X6 4 TB Portable Solid State Drive - Internal

Very fast data transfer and so far has stood up to some pretty hostile environments. Very compact size makes it perfect for field use or travel. Considering buying another for backup use only, because the one I own has been so stable in light of the abuse it has suffered.

It's shockingly small for its capacity, easily fitting into the palm of my hand. Completely silent, and haven't had any issues with data loss yet. I bought a second for my brother and a third for my father, it's so good.

Love how small this is. Works great and so far has performed incredibly well for us. Plug and Play makes installation a breeze. Being from a brand like Crucial, I have no worries of data loss or corruption. I have used without issue for months now and would highly recommend to others as an IT professional.

I bought this 4TB Crucial solid state drive to replace a 4TB Seagate spinning hard drive. I was happy to see a Black Friday price of just $150, and that was an insta-purchase for me. Small, fast, capacious, and pretty cheap! Well, it's cheap for a reason: it dramatically slows down write speeds if transferring 10GB or more at a time.When I got the drive, I ran a Blackmagic Disk Speed Test on the drive: 1425 MB/s write, 727 MB/s read. That's pretty solid!I transferred all the content from my 4TB Seagate to my new Crucial drive. It took about 6 hours for 2.5TB of data to transfer. Once it was done, I moved about 20GB of data from another drive, and that's when I noticed it was really slow all of a sudden. After the transfer finished, I ran Blackmagic again, and with a 5GB test, the drive had write speeds of about 700 MB/s for the first two tests, but by the third, it was down to 50 MB/s, I tested my 4TB Seagate spinning hard drive, and it was 150 MB/s after three 5GB tests. My spinning hard drive was 3x faster writing data than my solid state drive!I thought maybe the computer might be indexing the Crucial drive, so I let it sit for three days. Same issue when I tested again. So I thought maybe macOS doesn't like exFat, and I erased the drive, formatted as APFS, and transferred the 2.5TB again. It's been about 24 hours since the transfer finished, and the Crucial drive still slows to just 50 MB/s write speed after 10GB of transferred data. I'm inclined to think this is just how Crucial made this drive, as it is super repeatable, with various formats, and various tests (I also tried 3GB and 1GB tests - once it gets to about 10GBs of transferred data, it slows to about 50 MB/s.)I only have one other external SSD, a Samsung T7. Running the same test, it consistently has write speeds of 400 MB/s after 10GB of transferred data.I don't know why the Crucial drive is so slow for large transfers. I was so happy when I got it and ran the first test, and got 1400 MB/s write speeds. And honestly, I'd be happy if it could sustain 400 MB/s write speeds. But being 1/3 the speed of a spinning hard drive? That's just embarrassing, and unacceptable. This drive is getting returned, and I'm going to stick with Samsung.

Pros: Much faster than each of the non-SSD external drives that I have connected to my desktop computer's USB 3.0 ports.Cons: The cable length is too short (at 9 inches connected with only the C-type connector, or 10.5 inches when the C-type connector is connected to a USB-A type adapter).Comparison tests that I ran:My computer (in case this matters) is a Windows 10 with an Intel i7-4790K CPU. In side-by-side comparisons of the ''copy'' files function, testing the same set of 5 different file folders, copied to a Crucial X6 SSD and also copied to a Seagate Portable HDD and a Western Digital WD Elements WESD Portable HDD, with all 3 external drives connected to three different USB 3.0 ports, the Crucial X6 SSD was faster, ranging from roughly 2X faster to 7X faster than this Seagate HDD and Western Digital HDD. Overall, in a set of 5 tests, the Crucial X6 averaged approximately 3X to 4X faster versus each of these two HDDs.The copy speeds (of this Crucial) ranged from a low of ~ 10 MBps to 400 MBps. Large files (such as video >= 1 GB files) copied much faster than small files (such as small low resolution photos < 1 MB file size).Caveat: My review does NOT cover longevity or reliability of this product (Crucial X6 SSD) because I have only used it for 12 days.