Is this OEM or retail?

This drive is a retail item. Only requires installation and formatting to use.

Will this be reliable in a server application used mostly for backup?

Yes, the SAMSUNG 870 EVO 4TB Internal SSD is recognized for its reliability and long-term performance, making it suitable for various tasks including server applications and backups.

I had a western 4gb drive in a external usb box and could only format 2gb. I'm afraid I would have the problem with this drive?

You had an external drive enclosure that was incompatible, or operating system issues and you need to initialize 4tb drives with GPT partition. There is no issues with these drives if your os, enclosures, and partitions are correct.

What is the actual storage capacity of the SSD 4T|SAMSUNG MZ-77E4T0B/AM R?

This actually depends on the file system and other factors. You can't reliably calculate this without these details. If anyone tells you otherwise it's not a guarantee you'll get the same capacity. Worse is that with a change in 'standard' 4TB no longer means what it used to (more specifically storage should be powers of 2 so a kilobyte should be 1024 bytes but due to 'improvements' they changed it to 1000: which lets companies get away with a bit less storage, to say nothing of irking programmers).

Are mounting screws included?

No, mounting screws are not included.

is it compatible with the dell xps 15 9520?

I'm no expert, but I don't believe so. according to google you would need a M.2 2230/2280 card. There are tabs on this site to find which kind you need and which one would be best for you.

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Item#: N82E16820147795

SANDISK 4TB Optimus™ GX PRO 850X PCIe® 4.0 x4 M.2 2280 NVMe™ SSD - SDSP81400TAN-000E0

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$1,399^.99

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SAMSUNG 870 EVO 4TB 2.5 Inch SATA III Internal SSD (MZ-77E4T0B/AM) , Black

Name: SAMSUNG 870 EVO 4TB 2.5 Inch SATA III Internal SSD (MZ-77E4T0B/AM) , Black
Uploaded: 2026-07-16
Description: SAMSUNG 870 EVO 4TB 2.5 Inch SATA III Internal SSD (MZ-77E4T0B/AM) , Black

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SAMSUNG 870 EVO Series 2.5" 4TB
$1,399.99
SAMSUNG 870 EVO Series 2.5" 4TB
SAMSUNG SSD 9100 PRO 2TB, PCIe 5.0x4 M.2 (MZ-VAP2T0B/AM)
$1,299.98Combo Savings $500.00
SAMSUNG 870 EVO Series 2.5" 4TB
SAMSUNG 990 PRO Samsung 990 PRO 2TB
$1,289.98Combo Savings $500.00
SAMSUNG 870 EVO Series 2.5" 4TB
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SAMSUNG 990 PRO M.2 2280 1TB
$1,139.43Combo Savings $500.00
SAMSUNG 870 EVO Series 2.5" 4TB
SAMSUNG SSD 9100 PRO 1TB, PCIe 5.0x4 M.2 (MZ-VAP1T0B/AM)
$1,149.98Combo Savings $500.00

THE SSD ALL-STAR: The latest 870 EVO has indisputable performance, reliability and compatibility built upon Samsung's pioneering technology.Computer Platform:PC.Environmental Specs - Shock : 1,500 G & 0.5 ms (Half sine). Performance - Encryption : Class 0 (AES 256) TCG/Opal v2.0, MS eDrive (IEEE1667).
EXCELLENCE IN PERFORMANCE: Enjoy professional level SSD performance with 870 EVO, which maximizes the SATA interface limit to 560/530 MB/s sequential speeds, Accelerates write speeds and maintains long term high performance with a larger variable buffer
INDUSTRY DEFINING RELIABILITY: Meet the demands of every task from everyday computing to 8K video processing, with up to 2,400 TBW.
MORE COMPATIBLE THAN EVER: 870 EVO has been compatibility tested for major host systems and applications, including chipsets, motherboards, NAS, and video recording devices

🔥Don't forget your OS, we have Windows 11 OEM, Download and USB versions available

Combo Up Savings Up To $980+

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SAMSUNG 870 EVO 4TB
SSD (PART NUMBER: MZ-77E4T0B/AM) IS A HIGH-PERFORMANCE, 2.5 -

Brand	SAMSUNG
Series	870 EVO Series
Model	MZ-77E4T0B/AM
Part Number	MZ-77E4T0B/AM
Device Type	Internal Solid State Drive (SSD)
Used For	Consumer

Form Factor	2.5"
Capacity	4TB
Memory Components	V-NAND
Interface	SATA III
Protocol	SATA
Cache	Samsung 4GB Low Power DDR4 SDRAM
Encryption	Class 0 (AES 256) TCG/Opal v2.0, MS eDrive (IEEE1667)

Max Sequential Read	Up to 560 MBps
Max Sequential Write	Up to 530 MBps
Terabytes Written (TBW)	2400TB
MTBF	1,500,000 hours

Height	7.00mm
Width	70.00mm
Depth	100.00mm

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Item#: N82E16820147795

Best Sellers

SAMSUNG 870 EVO 4TB 2.5 Inch SATA III Internal SSD (MZ-77E4T0B/AM) , Black

Learn more about the SAMSUNG MZ-77E4T0B/AM

Customer Reviews of the SAMSUNG MZ-77E4T0B/AM

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info