M.2 2280 vs M.2 2242 Nvme SSDs in 2026: Key Differences
As an Amazon Associate we earn from qualifying purchases. Links on this page are affiliate links.
When you compare m2 2280 vs m2 2242 nvme SSD options, you are looking at two physical sizes for internal storage. Both drives use the SATA III interface and offer similar sequential speeds. They also both rely on SLC caching to manage performance. The main difference is the physical footprint. One is a standard 80mm length, while the other is a compact 42mm module. You need to check your motherboard or laptop slots to ensure compatibility with your chosen form factor.
Key differences
| Aspect | ADATA SU800 256GB M.2 SATA SSD | Transcend 120GB M.2 2242 SATA SSD |
|---|---|---|
| Form Factor | M.2 2280 | M.2 2242 |
| Interface | SATA III | SATA III |
| Max Read Speed | 560 MB/s | 560 MB/s |
| Max Write Speed | 520 MB/s | 500 MB/s |
| NAND Type | 3D TLC | 3D TLC |
| Warranty | not listed | 3-year |
Which one should you choose?
Choose ADATA SU800 256GB M.2 SATA SSD if
- You need a drive that fits standard desktop motherboards and most laptops.
- You want slightly higher sustained write speeds for larger file transfers.
- You prefer a model with more available capacity options like 1TB or 2TB.
Choose Transcend 120GB M.2 2242 SATA SSD if
- You are installing storage in a compact laptop or a Mini PC with limited space.
- You want a manufacturer-backed three-year warranty for peace of mind.
- You need a drive that supports Trim, S.M.A.R.T., and NCQ commands.
Verdict: Choose the M.2 2280 drive if you have standard space and want slightly better write performance. Pick the M.2 2242 model if your device requires a shorter drive or if you value the included warranty. Both offer the same read speeds and SATA interface for everyday tasks.
M.2 2280 vs 2242 SSD Specs
Physical dimensions
The ADATA SU800 uses the standard M.2 2280 form factor, measuring 80mm in length and 22mm in width. This is the most common size for desktop motherboards and many laptops. The Transcend MTS420S is an M.2 2242 drive, measuring only 42mm long. It shares the same 22mm width. The 2280 size offers more internal volume, which can sometimes aid in thermal management. The 2242 size is designed for compact systems where space is tight. You must check your motherboard or device specifications to ensure it supports the specific length you choose. Both fit into M.2 slots, but compatibility depends on the available slot length.
Interface type
Both drives utilize the SATA III interface. This means they are limited by the SATA protocol bandwidth, typically capping sequential speeds around 560 MB/s for reads. Neither drive uses the faster NVMe protocol. The ADATA SU800 and the Transcend MTS420S both operate within the same speed ceiling defined by SATA III. This interface choice makes them suitable for general computing tasks rather than high-end data transfer needs. They are compatible with most systems that have an M.2 slot supporting SATA signals. The interface does not differentiate these two models, as both adhere to the same standard.
Sequential speeds
The ADATA SU800 lists a maximum read speed of 560 MB/s and a write speed of 520 MB/s. The Transcend MTS420S offers a maximum read speed of 560 MB/s but a slightly lower write speed of 500 MB/s. Both drives achieve the typical upper limit for SATA III SSDs. The read performance is identical between the two products. The write performance gives a slight advantage to the ADATA model, offering 20 MB/s more throughput. For everyday tasks like booting an operating system or loading applications, this difference is minimal. Both provide consistent performance within the SATA constraint.
NAND flash type
The ADATA SU800 uses 3D TLC NAND flash memory. This type of memory stores three bits per cell, balancing capacity and cost. The Transcend MTS420S also uses 3D TLC NAND flash chips. Both manufacturers have chosen the same underlying storage technology. This similarity suggests that their baseline endurance and performance characteristics will be comparable. The use of 3D NAND allows for higher densities in a small physical footprint. Since both products rely on TLC technology, neither has a distinct advantage in terms of the raw media type used for storing data.
Storage capacity
The specific ADATA model listed has a storage capacity of 256GB. The specific Transcend model listed has a storage capacity of 120GB. The ADATA drive offers more than double the usable space of the Transcend drive in this comparison. Capacity is a critical factor for users who need to store large files or multiple operating systems. While other capacity options may exist for these product lines, the data provided shows a clear difference between these two specific units. If you require more space, the 256GB option is the superior choice based on the provided specifications.
Cache technology
Both drives employ SLC caching to boost performance. The ADATA SU800 uses SLC caching to manage write operations, while the Transcend MTS420S also features an SLC cache. This technology temporarily writes data to a faster, single-level cell portion of the drive before moving it to the slower TLC storage. This helps maintain higher write speeds during bursts of activity. Since both products utilize the same caching strategy, there is no technical difference in how they handle temporary data acceleration. This feature is standard for budget-friendly SATA SSDs to improve responsiveness.
Choose the right M.2 size for you
Users needing standard desktop or laptop storage
The ADATA SU800 uses the M.2 2280 form factor, which fits most standard desktop motherboards and many laptops. It offers 256GB of capacity with sequential read speeds up to 560 MB/s and write speeds up to 520 MB/s. This drive uses SLC caching to boost performance and includes a downloadable SSD toolbox for management.
Owners of compact or specific mini systems
The Transcend MTS420S features the smaller M.2 2242 form factor, making it suitable for compact systems or devices with limited space. It provides 120GB of storage with read speeds up to 560 MB/s and write speeds up to 500 MB/s. It also supports Trim, S.M.A.R.T., and NCQ commands for efficient data handling.
Buyers wanting higher capacity in standard size
If you need more storage space, the ADATA SU800 is available in larger capacities like 512GB, 1TB, and 2TB. The M.2 2280 size is widely supported, ensuring compatibility with most systems. It delivers reliable performance with 3D TLC NAND and SLC caching, maintaining speeds up to 560 MB/s for reads.
Quick picks
| # | Product | Best for | Price |
|---|---|---|---|
| 1 | ADATA SU800 256GB M.2 SATA SSD | Upgrading older systems with M.2 SATA slots | Check price of ADATA SU800 256GB M.2 SATA SSD on Amazon |
| 2 | Transcend 120GB M.2 2242 SATA SSD | compact systems needing 2242 SATA storage | Check price of Transcend 120GB M.2 2242 SATA SSD on Amazon |
The products compared
ADATA SU800 256GB M.2 SATA SSD
Best for: Upgrading older systems with M.2 SATA slots
- Form Factor
- M.2 2280 (what this guide is about)
- Storage Capacity
- 256GB
- Interface
- SATA
- Max Read Speed
- 560 MB/s
- Max Write Speed
- 520 MB/s
- Cache Type
- SLC Caching
View on Amazon: ADATA SU800 256GB M.2 SATA SSD Affiliate link
The ADATA SU800 is a 256GB M.2 2280 SSD using the SATA III interface. It features 3D TLC NAND and SLC caching to reach read speeds of 560 MB/s and write speeds of 520 MB/s. The drive uses an M+B key for compatibility. It suits users needing a standard 2280 form factor for desktops or laptops with SATA slots. It is not suitable for NVMe-only systems.
Pros
- Standard M.2 2280 form factor
- SATA III interface compatibility
- Read speeds up to 560 MB/s
- SLC caching for performance boost
Cons
- Limited to 256GB capacity in this listing
- SATA interface limits speed compared to NVMe
- Requires M+B key slot support
Good fit if
- You need a standard 2280 size SSD
- Your system supports SATA M.2 drives
- You want reliable 3D TLC NAND storage
Skip if
- You require NVMe PCIe speeds
- Your motherboard only accepts 2242 sizes
- You need more than 256GB capacity
Verdict: The ADATA SU800 256GB M.2 2280 SATA SSD is a practical option for upgrading systems with standard M.2 SATA slots. It delivers solid SATA speeds for everyday tasks but lacks the capacity and bandwidth of newer NVMe drives.
Transcend 120GB M.2 2242 SATA SSD
Best for: compact systems needing 2242 SATA storage
- Form Factor
- M.2 2242 (what this guide is about)
- Storage Capacity
- 120GB
- Interface
- SATA III 6GB/s
- Max Read Speed
- 560MB/sec
- Max Write Speed
- 500MB/sec
- Cache Type
- SLC Cache
View on Amazon: Transcend 120GB M.2 2242 SATA SSD Affiliate link
This Transcend drive uses the M.2 2242 form factor, measuring 42mm in length. It connects via SATA III 6GB/s, delivering read speeds up to 560MB/sec and write speeds up to 500MB/sec. The 120GB capacity relies on 3D TLC NAND with an SLC cache. It supports Trim and NCQ commands. You should choose this if your system requires the shorter 2242 size and standard SATA performance.
Pros
- M.2 2242 form factor fits compact slots
- SATA III 6GB/s interface for broad compatibility
- Read speeds up to 560MB/sec
- Built-in SLC Cache for improved responsiveness
Cons
- Small 120GB storage capacity
- SATA interface limits speeds compared to NVMe
- 3-year warranty is shorter than typical NVMe offers
Good fit if
- You need an M.2 2242 drive for a compact build
- You require standard SATA III performance
- You have light storage needs under 120GB
Skip if
- You need high-speed NVMe transfer rates
- You require more than 120GB of storage
- Your motherboard only supports M.2 2280 drives
Verdict: Transcend 120GB M.2 2242 SATA SSD is a compact storage solution for systems requiring the shorter 2242 form factor. It suits users with basic storage needs who prioritize physical size over high throughput.
Specifications side by side
| Spec | ADATA SU800 256GB M.2 SATA SSD | Transcend 120GB M.2 2242 SATA SSD |
|---|---|---|
| Storage Capacity | 256GB | 120GB |
| Interface | SATA | SATA III 6GB/s |
| Max Read Speed | 560 MB/s | 560MB/sec |
| Max Write Speed | 520 MB/s | 500MB/sec |
| Cache Type | SLC Caching | SLC Cache |
| Form Factor | M.2 2280 | M.2 2242 |
| Compatibility | not stated | Laptop, Desktop |
| NAND Type | 3D NAND, TLC | not stated |
| Dimensions | 0.87 × 0.14 × 3.15 inches | 0.87 × 0.15 × 3.15 inches |
| Weight | 0.32 ounces | not stated |
| Size | 256 GB | 120GB |
| Color | Black | Multicoloured |
| Model | SU800 M.2 256GB | TS120GMTS420S |
Frequently asked questions
Can I use an M.2 2242 drive in a slot meant for 2280?
No, you cannot fit a shorter drive into a longer slot without an adapter. The M.2 2242 form factor is physically smaller than the standard 2280 size. Most motherboards only have mounting holes for the longer 80mm length. You would need a specific bracket to make it work, which adds bulk and may not fit in slim laptops.
Is there a speed difference between 2280 and 2242 SSDs?
No, the physical length does not affect speed. Both the ADATA SU800 and Transcend MTS420S use the SATA III interface. This interface caps sequential read speeds at around 560 MB/s regardless of the drive's size. Performance depends on the controller and NAND type, not the form factor itself.
Which form factor has more storage capacity available?
The 2280 size generally offers higher capacity options. The ADATA SU800 listed here provides 256GB. The Transcend 2242 drive shown has 120GB. Manufacturers often prioritize larger capacities for the standard 2280 size because it fits more easily in desktops. Compact 2242 drives are often limited to lower capacities for basic tasks.
Do I need an NVMe drive for these sizes?
No, both M.2 2280 and 2242 drives can be SATA or NVMe. The products listed here use the SATA III interface. SATA M.2 drives work in systems that support SATA protocols. You do not need a PCIe lane or NVMe support to use these specific drives, making them compatible with older motherboards.
Will a 2242 SSD fit in my laptop?
Only if your laptop specifically supports the 2242 form factor. The Transcend MTS420S is designed for compact systems needing this shorter size. Most standard laptops and desktops use the 2280 size. Check your motherboard manual or physical slots before buying a 2242 drive, as they are less common than the 80mm length.
What is the difference between M.2 2280 and 2242?
The difference is purely physical dimensions. The 2280 drive is 80mm long and 22mm wide. The 2242 drive is only 42mm long but shares the same 22mm width. Both use the same M.2 connector keys for SATA or NVMe. Choose 2280 for standard compatibility and 2242 only if your device requires the shorter length.