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SanDisk

SanDisk 4TB Extreme Portable SSD - Up to 1050MB/s, USB-C, USB 3.2 Gen 2, IP65 Water and Dust Resistance, Updated Firmware - External Solid State Drive - SDSSDE61-4T00-G25

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Availability: Only 3 left in stock, order soon!
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Arrives Friday, Feb 13
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Color: Black


Capacity: 4TB


Features

  • Get NVMe solid state performance with up to 1050MB/s read and 1000MB/s write speeds in a portable, high-capacity drive(1) (Based on internal testing; performance may be lower depending on host device & other factors. 1MB=1,000,000 bytes.)
  • Up to 3-meter drop protection and IP65 water and dust resistance mean this tough drive can take a beating(3) (Previously rated for 2-meter drop protection and IP55 rating. Now qualified for the higher, stated specs.)
  • Use the handy carabiner loop to secure it to your belt loop or backpack for extra peace of mind.
  • Help keep private content private with the included password protection featuring 256bit AES hardware encryption.(3)
  • Easily manage files and automatically free up space with the SanDisk Memory Zone app.(5)

Description

Your life’s an adventure. To capture and keep its best moments, you need fast, high-capacity storage that accelerates every move. 1050MB/s read and 1000MB/s write speeds let you store your content and creations on a fast drive that fits seamlessly into your active lifestyle. Up to two-meter drop protection (3), with IP55 water and dust resistance (3), a carabiner loop for securing the drive. From the brand trusted by professional photographers, the SanDisk Extreme Portable SSD provides fast solid state performance in a tough, reliable storage solution. 1GB = 1,000,000,000 bytes, 1TB = 1,000,000,000,000 bytes. Actual user capacity less. Up to 1050MB/s read speed, up to 1000MB/s write speed. Engineered with proprietary technology to reach speeds beyond UHS-I 104MB/s, requires compatible devices capable of reaching such speed. Based on internal testing; performance may be lower depending on host device, interface, usage conditions and other factors. 1MB=1,000,000 bytes. (1) See official SanDisk website. (2) Password protection uses 256-bit AES encryption and is supported by Windows 8, Windows 10 and macOS v10.9+ (Software download required for Mac, see official SanDisk website.) (3) Based on internal testing. IPEC 60529 IP 55: Tested to withstand water flow (30 kPa) at 3 min.; limited dust contact does not interfere with the operation. Must be clean and dry before use.

Digital Storage Capacity: 4 TB


Hard Disk Interface: USB 3.2


Connectivity Technology: USB


Brand: Sandisk


Special Feature: Not_Performance_Used


Hard Disk Description: Solid State Drive


Compatible Devices: Tablet


Installation Type: Portable


Color: Black


Hard Disk Size: 4 TB


Hard Drive: ‎4 TB Solid State Drive


Brand: ‎Sandisk


Series: ‎SanDisk Extreme Portable SSD


Item model number: ‎SDSSDE61-4T00-G25


Hardware Platform: ‎Mac, PC


Item Weight: ‎1.76 ounces


Product Dimensions: ‎0.38 x 2.07 x 3.97 inches


Item Dimensions LxWxH: ‎0.38 x 2.07 x 3.97 inches


Color: ‎Black


Flash Memory Size: ‎4


Hard Drive Interface: ‎USB 3.2


Voltage: ‎1 Volts


Batteries: ‎1 12V batteries required.


Manufacturer: ‎Western Digital Technologies, Inc.


Language: ‎English


Is Discontinued By Manufacturer: ‎No


Date First Available: ‎January 2, 2021


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Friday, Feb 13

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.

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I picked up the SanDisk 2TB Extreme Portable SSD as an upgrade from my older external hard drives, and it’s easily one of the best storage devices I’ve used. The speed difference alone makes it worth it—transfers that used to take minutes on my traditional hard drives now finish in seconds. Large files, videos, photos, and backups move incredibly fast with no lag or stuttering. The size is another huge win. It’s unbelievably compact—smaller than most phones and light enough to clip onto a backpack or keep in a pocket without even noticing it’s there. Despite the small size, it feels durable and solid, with a rugged rubberized exterior that helps protect it from drops and everyday wear. Compared to traditional hard drives, there’s no spinning disk, no noise, and no worrying about bumps causing damage. It stays cool during most normal use and has been extremely reliable so far. I use it for work files, media storage, and backups, and it has handled everything without a single issue. A few small caveats worth mentioning: • It can get a little warm during long or heavy file transfers (not dangerously hot, just warm to the touch). • To get the full advertised speed, you need a USB-C port that supports USB 3.1/3.2 Gen 2. On older ports, it will still work fine but will be slower. • Like most SSDs, it’s pricier than traditional external hard drives, but the speed and portability make the difference worth it. • The included cable is on the shorter side, so you might want a longer one depending on your setup. Overall, this SanDisk Extreme SSD is a huge step up from regular external drives—faster, smaller, tougher, and much more convenient. If you need a dependable portable drive with great performance, this one is absolutely worth it. ... show more
Reviewed in the United States on November 22, 2025 by Sam
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This is a good SSD. It does heat up, get a little warm, but never too hot. It’s small, and fits in my pocket. It’s about half the size of my phone, and uploads always take pretty reasonable times. It’s easy to plug in, just as long as you have a USB-C port in your laptop/phone/computer/tablet, since it works with all of those. It’s very versatile, and quick. ... show more
Reviewed in the United States on December 23, 2025 by Lorenzo
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Well made and easy to use portable SSD. Nice bright blue color helps quick identification in a dark pack. Reasonable fast read and right speeds for a USB 3.2 product. Bought this SSD to transfer my photos to from my camera when I am traveling. Light weight and small SSD make a great traveling storage unit. ... show more
Reviewed in the United States on December 6, 2025 by The Twiggs Family
    • The best external hard drive I've ever used.
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My old PC had the regular non SSD 4TB hard drive. It was a top of the line unit when I bought it, made for gaming, extremely fast refresh rate, etc... I would have had to replace the motherboard when Windows 10 will no longer be supported. My wife uses this computer and wanted a new one. I knew that I would get a new PC with a SSD (which is what my laptop has) and I knew that the SSD has no lag time from startup to opening up a webpage. So I wanted an external hard drive that would match the speed of the new PC and this little 4TB SSD external hard drive did not disappoint. It took about 7 hours to transfer my data from my old PC to the SSD external drive (previously it took about 24 hours). When I transferred my data to the new PC with this SSD it only took about an hour and a half. That was well over 1TB. Wow. I am impressed with the transfer speed. It works flawlessly, makes absolutely no noise, writes at lightning speed, takes up very little space, and is just awesome overall. I recommend this drive to anyone that has a lot of data to transfer and very little time to do it. ... show more
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Reviewed in the United States on December 18, 2025 by Nerk
    • Would have been 5 stars if it could keep high sustained write speeds when it's partly filled
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Review Image by Pavel B. Pavel B.
Review Image by Pavel B. Pavel B.
Review Image by Pavel B. Pavel B.
This SSD uses TLC NAND memory, which is a good feature. However, it seems it lacks an internal DRAM cache, which is not very good. I'm not 100% sure tbh about the absence of the DRAM cache, it's difficult to find detailed specs for this drive, but from what I googled, it seems it doesn't have a DRAM cache. The main issue for me—and the reason I deducted one star—is that once the drive is partially filled, the write speed for large files drops to approximately 438 MB/s. When the disk is empty, CrystalDiskMark reports sequential read and write speeds of around 1 GB/s. However, CrystalDiskMark is not a good test for real-world performance, at all (I’ll explain this in more detail below). In actual use, writing large files to an empty disk achieves speeds of about 736 MB/s. As mentioned earlier, the write speed decreases noticeably as the drive fills up. While this behavior is somewhat normal for SSDs, the speed drop can be much less pronounced in more expensive or higher-quality SSDs. That said, reading large files remains consistently fast with this drive, maintaining speeds of around 1 GB/s regardless of how full the disk is. Recently, I realized I didn’t know as much about SSDs as I thought and had been relying too heavily on CrystalDiskMark for testing. Since then, I’ve educated myself on SSDs, learned how to test them properly, and even acquired several different SSDs for testing and experimentation. If you’re interested in learning more about SSDs and proper testing methods, feel free to read on. A lot of people use CrystalDiskMark for testing storage speed. You should know that using CrystalDiskMark is not a good way to test speed. It's a pretty limited test. It can't emulate the real-life use case of copying large files. Even if you choose 64 Gbyte test file size, CrystalDiskMark will simply create a 64Gb test file, but then it will only write or read a small part of that file. So if you want to copy large files with high speed, you need to test it by... no surprise here... by copying large files. Although I think it can be a surprize for a lot of people who rely on CrystalDiskMark. Make sure you will copy from another very fast SSDs, so that the read performance of that other SSD will not be the real bottle neck. I used my fastest internally isntalled NVME SSD to copy large files from (TLC NAND memory, SLC cache, DRAM cache, up to 7 Gbyte/s read & write speeds). Storage drives have different kinds of caches. SSD drives can have an SLC cache (SLC = Single-Level Cell, the fastest and most expensive type of NAND memory) and/or a DRAM cache (for example, an SSD can have 1Gb DDR4 internal cache). Consumer SSDs usually use QLC (Quad-level cell, stores 4 bits per cell, one of the slowest and less reliable types on NAND memory. Used in cheaper SSDs) or TLC (Triple-level cell, stores 3 bits per cell, faster and more reliable than QLC. Used in more expensive SSDs). You can see how an SLC & DRAM caches come into play, for example, here: https://www.techpowerup.com/review/silicon-power-xs70-1-tb/6.html More expensive SSDs also have an internal DRAM cache, which is used before the SLC cache (if present) is used. In 2024-2025 DRAM cache usually uses DDR4 memory. DDR4 cache is a few times faster than TLC for sequential reads & writes and has about a 1000x lower latency than TLC (nanoseconds vs microseconds). So when choosing an SSD, if you want high sustained write-speeds, you need to make sure the drive has the following characteristics (which often can be found in the SSD database on this website: https://www.techpowerup.com/ssd-specs/silicon-power-xs70-1-tb.d707 ): 1) TLC type of NAND memory (faster than QLC) 2) SLC Cache and the larger, the better (good drives nowadays have 100+ Gbytes of an SLC cache). You can see how an SLC & DRAM caches come into play, for example, here: https://www.techpowerup.com/review/silicon-power-xs70-1-tb/6.html 3) DRAM Cache and the larger, the better (1Gb+ DRAM cache is a good size) I'm sorry for this long text, I just hope I can help some people to understand SSDs and how to test them better and make better choices when buying SSDs and SSD adapters. ... show more
Reviewed in the United States on January 11, 2025 by Pavel B. Pavel B.

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