Crucial X9 Pro 4TB Portable External SSD - Up to 1050MB/s Read/Write, External Solid State Drive, IP55 Water and Dust Resistant, USB-C 3.2 - CT4000X9PROSSD902

The Crucial X9 Pro 1TB Portable SSD is, well, an external hard drive. It performs the function of storing data, and it does it adequately. There's not much else to say. In terms of design, it's a black rectangular box. It's not an eyesore, but it's not winning any design awards either. The build quality seems fine – no complaints there. The size is standard for a portable SSD, which I guess is good if that's what you're looking for. Setting it up is a breeze. Plug it in, and it works. No complicated software or fancy features to navigate. It's a storage device, after all. Now, let's talk about speed. It transfers files quickly. I copied some files, and they were copied fast. I don't know the exact speed, but it was fast enough for my needs. So, that's a plus. One thing I appreciate is the storage capacity. 1TB is a decent amount of space, and it suits my basic storage needs. I don't know about its durability or long-term performance, but I guess time will tell. In terms of value for money, it's alright. There might be cheaper options out there, but this one does the job. If you're not too concerned about flashy features or a sleek design, this could be a decent choice.

So quick. If you’re moving from a hdd this is a massive jump. I run Lightroom catalogs from it and store my RAWs on it to edit in Lightroom. Works brilliantly. Very short cable not an issue at all, might want to consider a pouch for the back of your screen. Very light, very small. Class!

Fast read and write speeds, durable, and very portable! 1TB storage is more than enough for me to store my large music sessions and files, as well as documents I don't want taking up space on my main devices. Highly recommend!

I needed another 2Tb SSD for my Linux machine. Initial the SSD drive worked, but odd errors kept on occurring. It appeared the new SSD drive was faulty, however, I order a Ugreen usb-c to usb-c cable from Amazon and use it instead of the cable that came with the SSD drive. My problems went away, and for the past 4 days, the SSD drive is working perfectly.

EDIT Was initially please (see below review). However the drive refused to mount today on either of my Macs, less than 3 weeks after purchase and with very minimal use. In disk utility, disk can't be repaired, erased or reformatted. Reported as corrupt with internal errors. I thought the price was too good to be true! Turned out to be the case. A very convenient, tiny 4TB drive. Half the size of my previous Seagate 1TB USB SSD. In Black Magic tests I was able to get around 850Mbs, using the Thunderbolt 3/USBc connection on a 2019 iMac. So not quite the 1050 max advertised, but not too shabby. As a guide, I was able to run moderately sized Logic Pro and Cubase projects directly off the Seagate at speeds of 450Mbs, so I'm more than confident, that this new drive will be up to similar tasks. Final Cut Pro was a struggle for the Seagate, so I will have to see how the Crucial fares there. One thing to watch out for with the Crucial is (i guess due to its physical size and larger storage size capacity), is that it does run quite hot. I'd be interested how that affects its overall longevity. But all-in-all, a decently fast, super conveniently small sized external SSD, which unless you want to step up to the cost of aa M.2 drive and compatible, quality chipset enclosure, still presents fantastic value for money.

I use this for backups of large photo and video files. It seems to work very well for that. My other corresponding backup device is a Sandisk Extreme (with the same 2TB capacity). I tested the comparative write speeds by copying a chosen folder on the internal SSD of my fairly fast Windows PC to each external SSD in turn. In a competely like-for-like comparison the Crucial X9 Pro had a steady transfer rate of ~550 MB/s (first picture - I just happened to do that screen-grab when it had momentarily dipped to 522 MB/s). In contrast, the Sandisk Extreme had a time-varying write speed which settled at a somewhat choppy ~370 MB/s (second picture). So, the sustained write speed of the Crucial X9 Pro appears to be about half as fast again as the Sandisk Extreme. In all other respects the Crucial X9 Pro and Sandisk Extreme are broadly similar, although the former is somewhat smaller physically. I deliberately chose two different drives as my backup devices, so that any issues which affected some/all instances of a given model wouldn't impact both of my backup copies. If I had to buy only one, I would choose the Crucial X9 Pro over the Sandisk Extreme.

Frist impressions are great. Its crazy small. I knew the device was small. But it was until it was in my hand that I realise. It is similar size to a small matchbox, but half its height. I got the 1TB version. And no doubt the 2 or 4TB versions are no different by the looks of it. When I compare my small passport 4TB drive to this, the mypassport drive is now very clunky looking. Sign of the times. Top is a little slippery. However, the base has a nice thin rubbery feel that gives it some grip, so unlikely to slip off your fingers. Speed: USB C 3.1 on its own is the 10 Gbps or 1250MB/s maximum theoretical limit. Achieved transfer at 600MB/s with medium files size, directly or across a USB Hub. Around about 50% of max. Copying these files within the laptop's SSD drive, I achieve avg 350-400MB/s. Copying off drive, you'd expect some gain, so achieving 600MB/s is pretty reasonable. I imagine that will well be the laptop's own SSD drive read speed limit. Realistically, for external transfer, I went from 35MB/s to 600MB/s. Near 20x performance to me is nothing short of wow. For durability, time will tell. If I don't come here to update this, its going strong. (April 2024)

4 months after using it is still fast and storing my data safely. When copying 500+ GB in 1 go it can have some heating but not concerning so far. I use it with mac devices. Didn’t try for windows yet, but my partition is set for mac so.. recommended! I purchased for 269 in february 2026.

If you use it on Mac, make sure to use Mac format to avoid data loss.

The SSD drive came preformatted and worked straight out of the box. Fast performance with USB 3. Used it as External Storage. Very small form factor which is surprising and handy.

This is so small that you can hide it inside your closed palm. I connected it as a bootable disk on my 2019 iMac and made my computer 50 times faster! I am thinking of buying the 4TB version as well to replace all my external hard disks.

Product as described, good speed for your average media transfers

I have been buying Crucial brand products for years. RAM, SSD's. It is a brand that I have come to trust and love. This 4TB X9 Pro SSD is no slouch as my benchmark in BlackMagic will show. I tested it with a 5gb test file written and read using my Mac Mini M4 Thunder Bolt 4 (USB C) port directly connected to the SSD and it would peak at 1000mb (1gb) per second write but averaged a consistent 914.2 mb/s and would peak at 1100mb (1.1gb) per second read but averaged 847.1mb/s. Far faster than USB 3 standards which when I connected it to these ports came in around 80mb/s with a peak of 300mb/s write and similar for the read. So you can see that if the computer can do the speed like my Mac M4 Mini can on its Thunderbolt 4 (USB C) port, then the drive can keep up. I bought this drive so that I can directly record 4K video onto it using my video capture device. I have been archiving hours of VHS tapes into digital format and some of these tapes can run for 6 hours so the files are huge once captured. This SSD is more than fast enough to keep up with the capture software capturing in 4K so that I have the absolute best RAW copy of the VHS tape for archiving purposes and then once it's in digital format I can drop down the bit-rate and resolution to save space without sacrificing the initial quality of the capture. So what can I say? You won't be disappointed with this SSD and if you are then it's probably your own equipment that is the problem because this SSD is really fast and being a Crucial brand product means you can trust it. The Pro series makes it even better by using ultra high quality flash memory that protects your stored bits using TLC SSD memory instead of QLC. Get one folks... 4TB when on sale it's a really good deal!