Western Digital vs SK Hynix: Nvme SSDs Compared by Specs
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This guide compares the western digital vs SK Hynix nvme SSD options, though note that the SK Hynix drive listed here is actually a SATA model. You are looking at two distinct storage solutions with different interfaces and form factors. Both offer reliable performance for their respective categories. The Western Digital drive is an external portable unit, while the SK Hynix drive is an internal 2.5-inch SSD. Understanding these physical and connection differences helps you pick the right fit for your setup.
Key differences
| Aspect | Western Digital My Passport 256GB Portable SSD | SK Hynix Gold S31 500GB SATA SSD |
|---|---|---|
| Interface | USB 3.1 Gen 2 | SATA Gen3 |
| Form Factor | External Portable | 2.5 inch |
| Max Read Speed | 540 MB/s | 560 MB/s |
| Max Write Speed | not listed | 525 MB/s |
| Cache Type | not listed | HYPERWRITE, DRAM |
Which one should you choose?
Choose Western Digital My Passport 256GB Portable SSD if
- You need a portable drive for external storage and frequent travel.
- You want hardware encryption and password protection for data security.
- You prefer a compact unit that connects via USB Type-C.
Choose SK Hynix Gold S31 500GB SATA SSD if
- You are upgrading an internal SATA slot in a desktop or laptop.
- You require DRAM cache for consistent performance under heavy loads.
- You want a drive with a stated 5-year warranty and high endurance rating.
Verdict: Choose the Western Digital drive if you need portable, encrypted external storage. Pick the SK Hynix Gold S31 if you are installing an internal drive and want SATA performance with DRAM cache. Your decision depends entirely on whether you need external portability or internal system expansion.
WD vs SK Hynix SSD Specs
Interface type
Western Digital My Passport uses a USB 3.1 Gen 2 interface. This makes it an external portable drive designed for easy plug-and-play connectivity with laptops and desktops. SK Hynix Gold S31 relies on a SATA Gen 3 interface. This is a standard internal connection for desktops and older laptops. The USB connection on the Western Digital drive offers immediate portability without internal installation. The SATA connection on the SK Hynix drive requires opening your case. You must choose based on whether you need external mobility or internal integration.
Form factor
The Western Digital My Passport is an external portable drive. Its compact dimensions are 3.5 inches in length, 1.8 inches in width, and 0.39 inches in height. It weighs just 1.44 ounces. This small size allows you to carry it in a pocket or bag. The SK Hynix Gold S31 is a 2.5 inch internal SSD. It measures 3.94 inches in length, 2.75 inches in width, and 0.28 inches in height. It weighs 1.85 ounces. This larger footprint is designed to fit inside computer chassis. You will need an internal bay or adapter for the SK Hynix unit.
Transfer speed
The Western Digital My Passport offers max read speeds up to 540 MB/s. This speed is achieved via its USB 3.1 Gen 2 connection. It is sufficient for moving large files quickly between devices. The SK Hynix Gold S31 provides sequential read speeds up to 560 MB/s and write speeds up to 525 MB/s. These speeds are delivered through its SATA Gen 3 interface. The SK Hynix drive has a slight edge in maximum read throughput. However, both drives offer similar performance levels for general file transfers and everyday computing tasks.
Cache type
The SK Hynix Gold S31 features HYPERWRITE cache technology and includes dedicated DRAM. This hardware cache helps manage data flow more efficiently, especially during heavy workloads. It contributes to the drive's stability and sustained performance. The Western Digital My Passport specifications do not list a specific cache type or DRAM presence. It focuses on USB connectivity and external reliability. The presence of DRAM in the SK Hynix drive is a technical advantage for consistent performance. The Western Digital drive relies on its USB controller for data management.
Security features
The Western Digital My Passport includes password protection with hardware encryption. This feature helps keep your data secure if the drive is lost or stolen. It also includes WD Security software for managing access. The SK Hynix Gold S31 specifications do not mention hardware encryption or password protection features. It focuses on reliability and performance for internal storage. If data security is a primary concern for your portable storage needs, the Western Digital drive offers built-in protections. The SK Hynix drive requires software-level encryption for similar security.
Choose the right drive for your needs
Users needing portable external storage with encryption
The Western Digital drive offers a USB 3.1 Gen 2 interface, making it a portable external solution. It includes hardware encryption and password protection for security. With read speeds up to 540 MB/s and a compact form factor, it is ideal for transferring files on the go while keeping your data safe and accessible.
Users upgrading internal desktop or laptop storage
The SK Hynix Gold S31 is a 2.5-inch internal SATA SSD. It features a DRAM cache and HYPERWRITE technology for consistent performance. With sequential read speeds up to 560 MB/s and write speeds up to 525 MB/s, it provides reliable internal storage. The 5-year warranty and high TBW rating ensure long-term stability for your system.
Users prioritizing internal reliability and write speeds
If you need internal storage, the SK Hynix drive uses a SATA Gen 3 interface. It delivers sequential write speeds up to 525 MB/s, which is faster than the Western Digital option. It also includes a DRAM cache for better performance. The 500GB capacity and 600 TBW endurance make it a robust choice for daily computing tasks.
The products compared
Western Digital My Passport 256GB Portable SSD
Best for: portable storage with encryption
- Storage Capacity
- 256 GB
- Interface
- USB 3.1 Gen 2
- Form Factor
- External Portable
- Max Read Speed
- 540 MB/s
- Dimensions
- 3.5 × 1.8 × 0.39 inches
- Weight
- 1.44 ounces
View on Amazon: Western Digital My Passport 256GB Portable SSD Affiliate link
This is a Western Digital external SSD with 256 GB of storage. It connects via USB 3.1 Gen 2 and delivers read speeds up to 540 MB/s. The drive includes hardware encryption for password protection. It measures 3.5 by 1.8 by 0.39 inches and weighs 1.44 ounces. You can use it with USB Type-C or USB-A ports. This drive suits users who need portable storage with basic security features.
Pros
- Read speeds up to 540 MB/s
- Hardware encryption for password protection
- USB Type-C and USB 3.1 Gen 2 compatible
- Compact dimensions at 3.5 by 1.8 by 0.39 inches
Cons
- 256 GB capacity is smaller than the 500 GB option on this list
- External form factor requires a cable connection
- No mention of included carrying case or physical lock
Good fit if
- You need portable storage with hardware encryption
- You prefer a compact drive for travel
- You want USB Type-C connectivity
Skip if
- You require more than 256 GB of space
- You need an internal NVMe drive
- You want the largest capacity available
Verdict: WD 256GB My Passport Portable SSD offers reliable external storage with hardware encryption. It fits users who prioritize portability and security over raw capacity.
SK Hynix Gold S31 500GB SATA SSD
Best for: Desktop SATA upgrades needing DRAM caching
- Storage Capacity
- 500GB
- Interface
- SATA Gen3
- Form Factor
- 2.5 inch
- Max Read Speed
- Up to 560MB/s
- Max Write Speed
- Up to 525MB/s
- Cache Type
- HYPERWRITE, DRAM
View on Amazon: SK Hynix Gold S31 500GB SATA SSD Affiliate link
The SK Hynix Gold S31 is a 500GB internal drive using the SATA Gen3 interface. It offers sequential read speeds up to 560MB/s and write speeds up to 525MB/s. The drive uses in-house 3D NAND, a controller, and DRAM cache. It fits standard 2.5-inch bays. This SSD suits users needing reliable storage for older systems or desktops that do not support faster NVMe connections.
Pros
- Sequential read speeds up to 560MB/s
- Includes dedicated DRAM cache for stability
- Uses proprietary HYPERWRITE cache technology
- Rated for up to 600 TBW endurance
Cons
- Limited to SATA Gen3 interface speeds
- Only available in 500GB capacity
- Bulky 2.5-inch form factor for internal use
Good fit if
- You need a reliable upgrade for a desktop PC
- You want a drive with dedicated DRAM cache
- You require high endurance for heavy writing tasks
Skip if
- You need the fastest possible NVMe speeds
- You are building a compact M.2 laptop
- You require storage larger than 500GB
Verdict: SK Hynix Gold S31 500GB SATA SSD delivers steady SATA performance with DRAM caching. It is the right choice for users upgrading desktops or older laptops who prioritize reliability and endurance over raw speed.
Specifications side by side
| Spec | Western Digital My Passport 256GB Portable SSD | SK Hynix Gold S31 500GB SATA SSD |
|---|---|---|
| Storage Capacity | 256 GB | 500GB |
| Interface | USB 3.1 Gen 2 | SATA Gen3 |
| Form Factor | External Portable | 2.5 inch |
| Max Read Speed | 540 MB/s | Up to 560MB/s |
| Max Write Speed | not stated | Up to 525MB/s |
| Cache Type | not stated | HYPERWRITE, DRAM |
| Size | 256 GB | 500GB |
| Dimensions | 3.5 × 1.8 × 0.39 inches | 3.94 × 2.75 × 0.28 inches |
| Weight | 1.44 ounces | 1.85 ounces |
| Color | Black | Gold |
| Model | WDBKVX2560PSL-WESN | SHGS31-500GS-2 |
Frequently asked questions
Is the SK Hynix Gold S31 an NVMe drive?
No, the SK Hynix Gold S31 is a SATA SSD. It uses the SATA III interface and comes in a 2.5-inch form factor. This makes it suitable for desktops and older laptops that do not support NVMe. It is not an NVMe drive, so it will not fit in M.2 slots designed for NVMe protocols.
What interface does the Western Digital My Passport use?
The Western Digital My Passport uses a USB interface. It is designed as a portable external storage device. This allows you to easily connect it to laptops and desktops via USB. It is not an internal drive, so you must have an available USB port to use it for storage expansion.
Which drive offers better portability?
The Western Digital My Passport is built for portability. It weighs only 1.44 ounces and measures 3.5 inches in length. The SK Hynix drive is heavier at 1.85 ounces and is a 2.5-inch internal unit. If you need to carry your storage, the WD option is the clear choice for mobile use.
Does the Western Digital drive include encryption?
Yes, the Western Digital My Passport includes hardware encryption. This feature helps protect your data by securing it at the drive level. It is ideal if you prioritize security while on the go. The SK Hynix model does not list encryption capabilities in its specifications, so the WD drive is the secure option here.
Can I use the SK Hynix drive in a modern NVMe slot?
No, you cannot use the SK Hynix Gold S31 in an NVMe slot. It is a 2.5-inch SATA drive. NVMe slots typically use the M.2 form factor. You would need a motherboard or laptop with a 2.5-inch SATA bay to install this drive. It is not compatible with M.2 NVMe slots.
Which drive has more storage capacity?
The SK Hynix Gold S31 has 500GB of storage. The Western Digital My Passport has 256GB. If you need more space for files and applications, the SK Hynix drive offers double the capacity. The WD drive is smaller in size and storage, focusing on portability rather than high capacity.