Running out of space on your iMac? An external SSD can make room for photo libraries, video projects, and everyday files without opening the computer or relying on cloud storage.
These 10 portable drives span compact 250GB options to a 4TB model. The best choice depends on how much space you need, which ports your iMac has, and whether the drive will stay on your desk or travel with you.
Best 10 Imac External Storage SSD Picks for 2026
Rugged Travel Pick
SanDisk Extreme Portable SSD 2TB
- 2TB capacity; up to 1,050MB/s reads
- IP65 rating and up to 3-meter drop protection
- 256-bit AES hardware encryption
Best For: High-capacity storage that travels with your iMac workflow
Everyday 1TB Pick
- 1TB capacity
- Up to 1,000MB/s stated reads
- USB-C and up to 2-meter drop protection
Best For: Everyday iMac files in a pocket-sized drive
Creative Workflow Pick
- 2TB capacity
- Up to 1,050MB/s reads and 1,000MB/s writes
- 256-bit AES hardware encryption
Best For: Portable photo and video project storage
Compact 500GB Pick
- 500GB capacity for selected files
- Up to 1,000MB/s stated reads
- USB-C and up to 2-meter drop protection
Best For: Small file sets and portable transfers
Best Everyday Pick
- 1TB capacity; up to 1,050 MB/s reads
- Compact aluminum body with drop protection
- Mac compatible with hardware encryption
Best For: Everyday backups and portable creative files
Best for Everyday Use
- 500GB in a lightweight aluminum case
- USB-C and USB-A cables included
- Up to 1,050 MB/s advertised reads
Best For: Portable transfers and smaller backup sets
Best for Large Creative Projects
- 2TB for larger working libraries
- Up to 2,000 MB/s with compatible Gen 2x2
- Thermal management for extended use
Best For: Large media projects and compatible high-speed setups
Best with Extra Features
- 1TB portable capacity
- Up to 1,050 MB/s reads
- USB-C and USB-A cables included
Best For: Everyday Mac storage and cross-device transfers
High-Capacity Travel Pick
SanDisk Extreme Portable SSD 4TB
- Large 4TB capacity
- IP65 and up to 3-meter drop protection
- 256-bit AES hardware encryption
Best For: Large Mac file collections carried between locations
Compact 250GB Pick
- 250GB for selected files
- Up to 1,050 MB/s reads
- USB-C and USB-A cables included
Best For: Portable transfers of modest file collections
Rugged Travel Pick – SanDisk Extreme Portable SSD 2TB
If your iMac external storage SSD also needs to travel, this 2TB SanDisk Extreme pairs USB-C connectivity with up to 1,050MB/s reads and 1,000MB/s writes. Its IP65 rating and up to 3-meter drop protection make it a practical choice for moving files between your desk and other locations.
Best For: iMac users who want a high-capacity drive for both desk use and travel.
Pros:
- 2TB capacity with fast stated read and write speeds.
- IP65 water and dust resistance and up to 3-meter drop protection.
- Carabiner loop and included 256-bit AES hardware encryption.
Cons:
- Actual transfer speeds depend on the host device and other factors.
- The rugged features may be unnecessary for a drive that never leaves the desk.
Choose this model when portability and protection matter as much as capacity. For an iMac that stays in one place, decide whether you will use its travel-focused features.
For straightforward iMac external storage SSD needs, this 1TB SanDisk Portable SSD offers USB-C connection and stated read speeds up to 1,000MB/s. Its slim, 1.12-ounce design is easy to carry when you need your files away from your desk.
Best For: Everyday file storage and transfers for iMac users who want 1TB in a pocket-sized drive.
Pros:
- Up to 1,000MB/s stated read speed.
- USB-C plug-in use without drivers or setup, according to the product notes.
- Up to 2-meter drop protection.
Cons:
- 1TB offers less room than the 2TB drives in this roundup.
- No write-speed figure is supplied in the product notes.
This is a simple middle-ground option if you want more room than 500GB without choosing a 2TB drive. Check your expected file sizes before settling on the capacity.
If your iMac external storage SSD will hold large photo or video projects, the 2TB Samsung T7 offers stated speeds up to 1,050MB/s read and 1,000MB/s write over USB 3.2 Gen 2. Its compact aluminum design also suits users who move projects between devices.
Best For: iMac-based creative work that calls for 2TB of portable project storage.
Pros:
- 2TB capacity and stated read/write speeds up to 1,050/1,000MB/s.
- Mac compatibility and a compact, 2.08-ounce design.
- 256-bit AES hardware encryption and fall protection up to 6 feet.
Cons:
- No IP water- or dust-resistance rating is supplied in the product notes.
- Reaching the stated speeds depends on the connected device and workflow.
The T7 is a strong fit when both capacity and stated write speed matter. If your drive will regularly face water or dust, compare it with an explicitly IP-rated option.
For an iMac external storage SSD intended for selected files rather than a large archive, this 500GB SanDisk Portable SSD keeps the capacity modest while offering stated read speeds up to 1,000MB/s. USB-C connectivity and a pocket-sized body make it convenient to move between your iMac and other compatible devices.
Best For: Carrying a smaller set of documents, photos, or active files.
Pros:
- Up to 1,000MB/s stated read speed.
- Slim, 1.12-ounce design with USB-C connectivity.
- Up to 2-meter drop protection.
Cons:
- 500GB is the smallest capacity in this roundup.
- No write-speed figure is supplied in the product notes.
Pick this model when a compact transfer drive is more useful than maximum capacity. For growing media libraries or full-project storage, a larger option will leave more room.
Best Everyday Pick – Samsung T7 Portable SSD 1TB
For imac external storage ssd, the Samsung T7 is a practical 1TB option for backing up photos, moving large files, and keeping projects portable. Its USB 3.2 Gen 2 connection supports advertised read speeds up to 1,050 MB/s and write speeds up to 1,000 MB/s.
Best For: iMac users who want a compact, versatile drive for everyday files and creative projects.
Pros:
- 1TB capacity with fast advertised read and write speeds.
- Compact aluminum body with stated drop protection up to 6 feet.
- Mac compatibility and 256-bit AES hardware encryption.
Cons:
- Its 1TB capacity may be limiting for extensive video libraries.
- Rated speeds depend on using a compatible USB connection.
The T7 balances portability, capacity, and speed without requiring a specialized 20Gbps port. Check your iMac’s available connection to set realistic transfer-speed expectations.
Best for Everyday Use – SSK Portable SSD 500GB
If you need imac external storage ssd for a smaller collection of files, the SSK Portable SSD offers 500GB in a lightweight aluminum case. Its included USB-C-to-C and USB-C-to-A cables make it easier to connect across devices, while advertised read speeds reach up to 1,050 MB/s.
Best For: iMac users who prioritize a small drive for transfers, backups, and travel.
Pros:
- Includes both USB-C-to-C and USB-C-to-A cables.
- Advertised speeds up to 1,050 MB/s read and 1,000 MB/s write.
- Lightweight aluminum housing with an activity LED.
Cons:
- 500GB fills faster than higher-capacity alternatives.
- High-speed caching is limited to a portion of available capacity.
This is a convenient choice when cable flexibility and a tiny footprint matter more than maximum storage. Its stated cache behavior is worth keeping in mind for especially large transfers.
Best for Large Creative Projects – Samsung T9 Portable SSD 2TB
For imac external storage ssd that can hold larger working libraries, the Samsung T9 pairs 2TB of capacity with USB 3.2 Gen 2×2 and advertised read and write speeds up to 2,000 MB/s. Its thermal-management design targets sustained use during longer creative tasks.
Best For: iMac users managing large media files who can also make use of a compatible high-speed connection.
Pros:
- 2TB capacity for sizable project libraries.
- Advertised read and write speeds up to 2,000 MB/s over USB 3.2 Gen 2×2.
- Thermal management, hardware encryption, and drive-health monitoring through Samsung Magician.
Cons:
- Its top advertised speeds require a compatible USB 3.2 Gen 2×2 connection; Mac compatibility alone does not establish that an iMac supports this mode.
- At 122 g, it is heavier than the other two drives listed here.
The T9 makes the most sense when both capacity and sustained transfers are priorities. Verify your iMac’s port capabilities before choosing it specifically for its 2,000 MB/s rating.
Best with Extra Features – SSK Portable SSD 1TB
For iMac external storage SSD shoppers who want room for files and backups without a bulky drive, this 1TB SSK is a compact option. It supports USB 3.2 Gen 2 and lists read speeds up to 1,050 MB/s when the connection allows.
Best For: Everyday file storage and transfers between a Mac and USB-A or USB-C devices.
Pros:
- Includes USB-C and USB-A cables for connecting to different devices.
- Small aluminum enclosure weighs approximately 36.6 g.
- Activity LED, S.M.A.R.T. diagnostics, and TRIM support add useful drive-management features.
Cons:
- Advertised speeds require a compatible 10Gbps connection.
- High-speed SLC caching is limited to a portion of available capacity.
The 1TB capacity makes this a more flexible everyday choice than a small transfer-only drive. For large sustained writes, keep the stated cache limit in mind.
High-Capacity Travel Pick – SanDisk Extreme Portable SSD 4TB
If your iMac external storage SSD needs to hold a large media library, the 4TB SanDisk Extreme offers substantially more space than the other drives here. Its USB 3.2 Gen 2 connection supports advertised reads up to 1,050 MB/s and writes up to 1,000 MB/s, subject to the host device.
Best For: Mac users carrying large collections of files between a desk and other locations.
Pros:
- 4TB capacity accommodates sizable file collections.
- Rated IP65 for water and dust resistance, with up to 3-meter drop protection.
- Includes password protection with 256-bit AES hardware encryption.
- Comes with a USB-C cable and USB-C-to-USB-A adapter.
Cons:
- Maximum advertised speeds may be lower depending on the iMac and connection.
- Its rugged features may be unnecessary for a drive that stays on a desk.
Choose this model when capacity and protection during travel matter as much as transfer speed. Its included adapter also makes it easier to connect to USB-A equipment.
Compact 250GB Pick – SSK Portable SSD 250GB
For iMac external storage SSD shoppers who need a small drive for selected projects rather than a large archive, this 250GB SSK is a portable choice. It supports USB 3.2 Gen 2 and advertises reads up to 1,050 MB/s with a suitable connection.
Best For: Moving a modest set of files between an iMac and other USB-C or USB-A devices.
Pros:
- Includes USB-C and USB-A cables for flexible connections.
- Compact aluminum body weighs approximately 36.6 g.
- Activity LED, S.M.A.R.T. diagnostics, and TRIM support are included.
Cons:
- 250GB capacity is limited for large media libraries or extensive backups.
- Advertised peak speeds require a compatible 10Gbps connection, and high-speed caching covers only part of the available capacity.
This is the practical SSK option when portability matters more than space. If you expect your stored files to grow, the 1TB version offers more headroom.
How We Picked the Best Imac External Storage SSD
We focused on the practical differences among the 10 selected drives: capacity, advertised transfer speeds, USB interface, portability, and stated durability features. The list covers affordable small-capacity choices, versatile 1TB and 2TB models, and a 4TB option for larger libraries. Advertised speeds are useful for comparing specifications, but they are not a promise of the transfer rate you will see on your iMac.
Quick Comparison
For a compact file drive, the 250GB and 500GB SSK models and the 500GB SanDisk Portable SSD offer smaller capacities. At 1TB, the SanDisk Portable SSD, Samsung T7, and SSK Portable SSD are flexible choices for documents, photos, and active projects. The 2TB SanDisk Extreme, Samsung T7, and Samsung T9 provide more breathing room; the 4TB SanDisk Extreme is the roomiest selection. The SanDisk Extreme models also list IP65 dust and water resistance, which may matter if you carry your drive away from the desk.
Key Buying Factors for an Imac External Storage SSD
Check the Port and Speed Match
Confirm the ports on your particular iMac before buying, and check whether you will need a USB-C cable, a compatible adapter, or a hub. Most drives here advertise speeds around 1,000–1,050MB/s over USB 3.2 Gen 2. The Samsung T9 advertises up to 2,000MB/s over USB 3.2 Gen 2×2, but many Macs do not support that mode at its full advertised speed. Do not pay extra for that headline figure unless you have confirmed the benefit for your setup.
Buy Enough Capacity for Growth
Leave room beyond what your files occupy today. A 250GB or 500GB drive can handle documents or selected projects, while 1TB or 2TB is often more comfortable for expanding photo libraries and media work. Consider 4TB if you want substantial portable space in one drive. Check the size of the files you plan to move rather than choosing solely by price per drive.
Plan Formatting and Backups
For Mac-only use, APFS is generally the straightforward format; exFAT is useful when you need to exchange files with Windows PCs. Reformatting erases a drive, so move any existing files first. If you intend to use the SSD with Time Machine, check your macOS version and setup requirements. Keep another copy of irreplaceable files—an external SSD is storage, not a backup strategy by itself.
Who Should Buy Which Imac External Storage SSD?
Choose a lower-capacity SanDisk or SSK model for occasional file transfers or a modest workspace. Look at the 1TB Samsung T7, SanDisk, or SSK drives for everyday expansion; move to a 2TB model if large files are routine. Pick a SanDisk Extreme if its stated IP65 protection suits your travel habits, or its 4TB version if capacity is the priority. Consider the Samsung T9 for its 2TB capacity and potential use with other compatible devices, but verify your iMac’s USB capabilities before buying it specifically for speed.