Crucial X9 4TB Portable SSD, Up to 1050MB/s, USB 3.2 USB-C, External Solid State Drive, Compatible with Windows, Mac, & Android, Reliable Storage for Games, Files, & Backups, Black - CT4000X9SSD902
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Availability:
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Arrives
Friday, Mar 20
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Capacity: 4TB
Style: X9 - up to 1050MB/s
Features
- High-speed Performance: Designed for casual gamers and everyday use, this external SSD with up to 1050MB/s accelerates large file transfers, media editing, and backup processes outperforming traditional hard drives
- Built to Last: Perfect for travel and all types of weather with IP55 water and dust resistance. Plus, it's drop resistant up to 7.5 ft (2 meters). This portable drive is designed for durability and reliability wherever you go
- Broad Compatibility: External drive connects effortlessly with Windows, Mac, iPad Pro, Chromebooks, Android, Linux, PS4, PS5, and Xbox via USB-C and USB-A for easy and fast file transfers
- High-Capacity Storage: Store all your photos, videos, backups, and more with this compact 4TB SSD. It's perfect for students, everyday users, and anyone needing secure and reliable storage for their files
- Bonus Software Included: Enjoy three months of Mylio Photos plus and Acronis True Image when you purchase and register your external drive
Description
The Crucial X9 4TB Portable SSD (CT4000X9SSD902) provides high-performance storage with read speeds of up to 1050MB/s, allowing for quick and efficient transfers of large files, including high-resolution photos, 4K videos, and gaming data. With its 4TB storage capacity, this external SSD is perfect for professionals, content creators, and gamers who need ample storage for their growing digital libraries. Built for portability and durability, the Crucial X9 is compact and lightweight, making it easy to carry wherever you go. Its IP55-rated water and dust resistance and drop protection from up to 7.5 feet ensure that your data remains safe in even the toughest conditions, whether you're traveling, working outdoors, or in harsh environments. The Crucial X9 is compatible with a wide range of devices, including PC, Mac, Android, and more, making it easy to transfer files across multiple platforms using USB-C connectivity. This combination of speed, capacity, and ruggedness makes the Crucial X9 4TB Portable SSD an excellent choice for users who need fast, reliable storage that can handle the demands of professional use and travel.
Digital Storage Capacity: 4 TB
Hard Disk Interface: USB-C
Connectivity Technology: USB
Brand: Crucial
Special Feature: Portable
Hard Disk Form Factor: 2.54 Inches
Hard Disk Description: Solid State Drive
Compatible Devices: Camera, Gaming Console, Laptop, Tablet
Installation Type: External Hard Drive
Color: Black
Hard Drive: 4 TB Solid State Drive
Brand: Crucial
Series: Crucial X9 4TB Portable SSD
Item model number: CT4000X9SSD902
Item Weight: 1.13 ounces
Product Dimensions: 2.56 x 1.97 x 0.39 inches
Item Dimensions LxWxH: 2.56 x 1.97 x 0.39 inches
Color: Black
Computer Memory Type: DIMM
Flash Memory Size: 4 TB
Hard Drive Interface: USB-C
Manufacturer: Micron
Date First Available: September 26, 2023
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Friday, Mar 20
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Capacity: 1TB
Style: X9 - up to 1050MB/s
Works great! And it’s wildly tiny.
Reviewed in the United States on March 2, 2026 by Evan Flournoy
Capacity: 4TB
Style: X9 - up to 1050MB/s
I’ve been using the Crucial X9 4TB Portable SSD for a few weeks now, and I’m seriously impressed. For those who want big storage without bulk, this is it. ⸻ What I love: • Compact & lightweight — It’s so small and thin, it easily fits in a jacket pocket or laptop bag without adding bulk. • Massive capacity — 4 TB gives me peace of mind. I can store video files, large photo libraries, backups, games, etc., without constantly juggling what to keep or delete. • Good speed — It delivers up to ~1050 MB/s (per Crucial) for sequential reads, which for me has meant fast transfers of large video files. (Of course, your speed depends on your USB-port, etc.)  • Durability — It has IP55 water/dust resistance and survives drops to about 7.5 ft / 2 metres (on carpet). That gives me confidence using it on the go.  • Compatibility — Works seamlessly with Windows, Mac, Android, etc. The USB-C interface + USB-A adapter makes it flexible for different devices.  ⸻ What to watch out for / minor drawbacks: • Speeds vary — It’s great when connected via a high-speed USB-C port, but if you use older or slower ports, you won’t get top performance. • Price — Naturally, a 4 TB SSD like this comes at a premium vs smaller drives or HDDs. If you don’t need all that space immediately, you might find smaller capacity options more cost-efficient. • Heat / throttling — I didn’t notice big issues yet, but as with many portable SSDs, heavy sustained transfers can warm it up. Just something I keep in mind. ⸻ Bottom line: If you’re after “big storage in a tiny package”, the Crucial X9 4TB hits the mark. Excellent for content creators, frequent travelers, or anyone who doesn’t want to worry about running out of space. Definitely worth the investment in my book.
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Reviewed in the United States on September 28, 2025 by We tried it! Thompson Family Finds We tried it! Thompson Family Finds
Capacity: 1TB
Style: X9 - up to 1050MB/s
I’ve known the name Crucial for about as long as I’ve been in the computer business yet I can’t say for sure if I ever ordered from them by brand. I do know their reputation is good. I’ve been spending my spare hours cleaning up files on my endless array of hard drives and SSD’s, I just got finished cleaning 205,000 files and I have more to go. One of the pitfalls of being a professional photographer and cinematographer and running a business is managing a lot of data. Today I went to open an often used Excel file and guess what, it was gone. And it was a super important one. So I stopped everything and did something I have meant to do for a long time. Get this SSD to do continuous backups of those things that I absolutely can’t lose, ever. I do have a good manual backup routine, hence all those backup drives but what was missing is being able to keep a history of my work on a daily basis I wanted something small that I could plug in to one of the USB-C ports of my Z2 G9, a very capable workstation. I have three such fast ports so no worries there. I didn’t need anything fancy or a cool belt lanyard or bright colors or lots of fluff ware and I don’t plan to drop it but there are no moving parts so that doesn’t concern me. What I did want is speeds keeping with the latest standards, because why not, and I wanted media that’s as relatively safe as possible, which I will never believe is a hundred percent possible with any storage drive, disk or solid-state. I scoured as many tech articles as I could find and the X9 seems to be one of the most highly regarded there is. I avoid the brand that starts with s because it seems everything I buy from them I regret and I try not to do business with them. THE NEED FOR SPEED I stay miles away from any discussion having to do with speeds for a gadget like this. It’s all a game with no winner. It’s like saying my brother can run faster than some guy in Cincinnati or my Yugo is faster than yours. There is only one answer to storage media speed – your speed will depend on stuff. Everybody’s computers, phones, files, and everything else are different, and a bench test is just that, unless that’s all you’re going to do with this thing. In real life the speed you get will depend on stuff. Knowing my workstation’s ports can support it I did do a quick test and found that I was able to achieve some fast read speeds. Then in real life I did a full backup using TrueImage and my overall average was about 203 mbps. Any other speedy capabilities of this device were pretty much wasted. OH PLEASE This is where I air my disappointments. Why is this thing plastic instead of aluminum or magnesium or titanium? What’s inside is three cents worth of silicon, couldn’t they spend another five cents on a decent case? And, what happened to including a basic version of some brand of backup software? I got the impression from their poorly done product page that they were saying they include Acronis, well they do but it is so stripped down that it is for all practical purposes worthless. They push hard on upgrading it, but it’s very clear that Acronis’ target client base is the IT departments of major corporations not us lowly consumers. The upgrade process went terribly, Unlike other software if you don’t pay the annual ransom they deactivate the whole product instead of letting you continue to use it. That subscription includes some questionable virus ware I don’t want or need, automatic renewal and worst of all it is set to allow them and anyone they sell your information to the right to spam you forevermore. And if you change your mind one second after paying for it you’re out of luck, they won’t give you your money back. They also include a three month trial of some photo cloud storage app that I would never use for my client work because of privacy concerns. And oh yeah, they will give you a whole whopping month of Adobe if you give them a whole lot of private information and agree to get their ads pushed to you by email. Storage Executive is another app you can download. I found it of dubious value, it features things that I can already do on my computer without having their app in the way, and by installing it you give them the right to automatically get access to your SSD for upgrades, this also is a privacy concern to me. Although this review is for the SSD, if my intent is to use it as a backup device, I found it was necessary to discuss this company’s poor choices when it comes to their embedded software apps. If you don’t use them this doesn’t apply to you. YES NO MAYBE The case is very lightweight and angular in shape, and very lightweight. If I bought this as my travel drive I would have been very disappointed that it is plastic. And I may have been disappointed that the included C-to-C cable is only a few inches long. But the cable is good quality, with strong strain reliefs and a robustly braided covering. I used a piece of #M Command tape to mount the drive to the bottom of my workstation where I could leave it permanently plugged in to a dedicated data port on the back of the computer. And I spent the thirty-nine bucks to get a paid version of TrueImage because it works for me. With my x9 mounted out of sight it is always plugged in and backing up, that was my intent when I bought this so overall I am fully satisfied. Despite the things I wish they would fix how can I say no to this thing? It’s a piece of functional gear that I need and it has a job to do. If it ends up not doing that job it goes back and I let the world know, wimple as that.
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Reviewed in the United States on September 6, 2024 by PhotoGraphics PhotoGraphics
Capacity: 4TB
Style: X9 - up to 1050MB/s
CrystalDiskMark reports max sequential read of 1067 MB/sec, and sequential write of 1039 MB / sec. Sustained transfers from NVMe to the drive through USB 3.2 Gen2 run about 650 MB/sec. CrystalDiskInfo reports operating temps while powered on and idle around 40-45C, even under a heavy load operating temps never hit 70C. Comes preformatted in exFAT, which ensures compatibility across different devices and OS environments (PC, Mac, Linux, Android, etc,) so if you aren't the most tech-savvy person, it will work well to plug and play right out of the box. This thing is unbelievably small, just a little bit bigger footprint than two USB sticks side by side, and has a smaller footprint than a credit card. Virtually no noise when in operation, because SSDs don't have any moving parts. The only drawback is that the housing is plastic, metal would have been nice for durability and to help with heat dissipation. If I were going to transport this drive frequently, I'd invest in a protective sleeve of some sort, just to prevent the possibility of the housing cracking if it was dropped on a hard surface, but for typical use it should hold up just fine. Any drive can and eventually will fail, and every drive model is going to have a certain amount of defective units, but I've written almost a TB of data to this drive, and so far, so good! I'll update this review if any problems become apparent, but thus far, this seems to be a quality SSD at a great price!
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Reviewed in the United States on November 26, 2025 by M. Ferrell M. Ferrell
Capacity: 2TB
Style: X9 - up to 1050MB/s
This is hands down the best budget portable SSD you can get right now. It’s durable, it’s fast, and it’s just plug and play, very simple. 2TB is plenty of space and works with whatever format you want to use it with. There’s no noise level, and it’s incredibly lightweight. Although it’s a great piece of gear, be careful when you’re plugging in and out multiple devices. I’ve had it corrupt because when I eject one drive and then plug another into the same exact port, there’s a chance it could corrupt and you’ll need a recovery tool to get your files out.
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Reviewed in the United States on October 31, 2025 by Anthony R Smith Anthony R Smith