I don't think this is actually an SLC drive... It seems like it just uses "SLC caching technology", which I think means it uses TLC NAND but treats the unused space as SLC for the purpose of caching until it starts to fill up. Does anyone know for sure?

I don't know of a way to find out for sure without a doubt. You just have to trust the manufacturer. SSD's have come a very long way, and all name-brand SSD's are very reliable regardless of the technology used. 240GB is a little small these days as well, and I regret not getting a larger drive.

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Western Digital 240GB Green M.2 2280 Internal Solid State Drive Model WDS240G1G0B

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M.2 2280
240GB
SATA III

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Green SSD M. 2 SATA 240GB

Model
Brand	Western Digital
Series	Green
Model	WDS240G1G0B
Device Type	Internal Solid State Drive (SSD)
Used For	Consumer

Details
Form Factor	M.2 2280
Capacity	240GB
Memory Components	TLC
Interface	SATA III

Performance
Max Sequential Read	Up to 540 MBps
Max Sequential Write	Up to 465 MBps
4KB Random Read	Up to 37,000 IOPS
4KB Random Write	Up to 68,000 IOPS
MTTF	Up to 1.75M hours

Features
Features	Improved performance for everyday computing Enhance your system with a WD Green solid state drive and help improve the performance of your laptop or desktop computer for your daily computing needs. SLC (single-level cell) caching technology helps boost write performance in a WD Green SSD to browse the web, play your favorite casual games, or simply start up your system in a flash. Solid state reliability Designed without any moving parts, WD Green SSDs are built to be lightweight and shock-resistant to help protect against data loss if a drive is accidentally bumped or dropped. Combined with the comprehensive WD Functional Integrity Testing Lab (F.I.T. Lab) certification, every WD Green SSD is tested to ensure it meets the highest WD brand standards for digital storage. And with no moving parts in a WD Green SSD, you get reliable storage to withstand normal wear and tear for years to come. Less power. More play. WD Green solid state drives are among the lowest in power consumption in the industry. And with less power used, you can run your laptop PC for longer periods of time. An easy upgrade for your PC WD Green SSDs are available in a 2.5"/7mm cased model, and an M.2 2280 version to evolve with newer and smaller computers. With form factors to accommodate most laptop and desktop PCs, a WD Green SSD is ready for the job. Free WD SSD Dashboard The downloadable WD SSD Dashboard provides a suite of tools so you're always able to check on the health of your solid state drive. Available for free, this WD SSD Dashboard helps you track things like disk model, firmware version, S.M.A.R.T. attributes, or simply find out how much space you have left on your WD Green SSD.

Environmental
Power Consumption (Idle)	Slumber (mW): 30 DEVSLP (mW): 3
Power Consumption (Active)	Average Active Power (mW): 50 Max Read Operating (mW): 2000 Max Write Operating (mW): 2500 Measured using the MobileMark 2012 benchmark with DIPM (Device Initiated Power Management) enabled.
Operating Temperature	0°C ~ +70°C
Storage Temperature	-55°C ~ +85°C
Max Shock Resistance	1,500G @ 0.5 msec half sine
Max Vibration Resistance	Operating Vibrations: 5.0 gRMS, 10-2000 Hz Non-operating Vibrations: 4.9 gRMS, 7-800 Hz

Dimensions & Weight
Height	2.23mm
Width	22.00mm
Depth	80.00mm
Weight	32.00 +/- 6.51g

Additional Information
First Listed on Newegg	August 16, 2017

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Limited Warranty period (parts): 3 years
Limited Warranty period (labor): 3 years
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Return Policies

Return for refund within: 30 days
Return for replacement within: 30 days
This item is covered by Newegg.com's 30-Day Return Policy.
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Manufacturer Contact Info

Manufacturer Product Page
Manufacturer Website
Support Phone: 1-800-275-4932
Support Website
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Western Digital 240GB Green M.2 2280 Internal Solid State Drive Model WDS240G1G0B

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Customer Reviews of the Western Digital WDS240G1G0B

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Warranty, Returns, And Additional Information

Warranty

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Manufacturer Contact Info

Item#: 0D9-001A-00080

Western Digital 240GB Green M.2 2280 Internal Solid State Drive Model WDS240G1G0B

Learn more about the Western Digital WDS240G1G0B

Customer Reviews of the Western Digital WDS240G1G0B

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info