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WD Red SN700 1TB NVMe SSD vs SanDisk Ultra SSD

The WD Red SN700 is the faster, newer drive: PCIe NVMe with roughly six times the sequential read speed of the SATA Ultra and a single-sided M.2 2280 layout that fits most modern laptops and desktops. The SanDisk Ultra is a 2.5-inch SATA drive, so it suits older machines and bays that have no M.2 slot, and its 4TB capacity and 600 TBW rating give it strong endurance for bulk storage. Buy the SN700 for a boot drive or any workload where speed matters; buy the Ultra only if your system has no M.2 slot or you need a large, cheap-per-gigabyte SATA drive.

  • Choose the WD Red SN700 if your board has an M.2 M-key slot and you want fast boot times, quick game loads and snappy large-file transfers.
  • Choose the SanDisk Ultra if you have a 2.5-inch SATA bay and no M.2 slot, or you want a large-capacity drive for bulk storage and backups.

Prices

  • WD Red SN700 1TB NVMe SSD: $137.87 at BlueDogInk (checked today)
  • SanDisk Ultra SSD: $74.99 at MelroseMAC (checked today)
  • Difference: the SanDisk Ultra SSD is $62.88 cheaper than the WD Red SN700 1TB NVMe SSD today
Sandisk
Sandisk WD Red SN700 Series 1TB M.2 2280 M-Key PCIe NVMe SSD Drive, single-sided (WDS100T1R0C)

WD Red SN700 1TB NVMe SSD

Sandisk WD Red SN700 Series 1TB M.2 2280 M-Key PCIe NVMe SSD Drive, single-sided (WDS100T1R0C)

$137.87at BlueDogInkObserved at 4:31 AM
See all prices and details
Visit BlueDogInk
Pros
  • PCIe NVMe speed, far ahead of any SATA drive
  • Single-sided M.2 2280 fits thin laptops and most desktops
  • No cables or drive bay needed
  • Suited to a boot drive, games and large file work
Cons
  • Needs an M.2 M-key slot; no SATA fallback
  • Smaller capacity than the Ultra at the same tier
  • Endurance rating not published here
  • Runs warmer under sustained load than a SATA drive
SanDisk
SanDisk Ultra SSD

SanDisk Ultra SSD

4.8(1,500 ratings)
$74.99at MelroseMACObserved at 8:07 AM
See all prices and details
Visit MelroseMAC
Pros
  • 4 TB capacity in one drive
  • 600 TBW endurance rating
  • Works in any 2.5-inch SATA bay, including older laptops and desktops
  • Rated shock and vibration resistant
  • Low idle power draw
Cons
  • SATA speed caps it at about 560 MB/s read
  • No NVMe or PCIe support
  • Encryption hardware present but not enabled
  • 2.5-inch size needs a bay and cables

What separates them

WD Red SN700 1TB NVMe SSDSanDisk Ultra SSD
InterfacePCIe NVMe (M.2 M-key)SATA III (6 Gb/s)
Sequential readUp to 3,400 MB/sUp to 560 MB/s
Sequential writeUp to 2,900 MB/sUp to 530 MB/s
Form factorM.2 2280, single-sided2.5-inch, 7 mm
Capacity1 TB (2 TB variant also listed)4 TB
Endurance (TBW)Not published for this listing600 TB
EncryptionNot specifiedController supports 256-bit encryption but it is not enabled
Shock and vibration resistanceNot specifiedRated shock and vibration resistant

Price history

$275.50$74.99
Nov 2Nov 9
  • WD Red SN700 1TB NVMe SSD: lowest $137.87 on Nov 9 at BlueDogInk.
  • SanDisk Ultra SSD: lowest $74.99 on Nov 9 at MelroseMAC.

Prices at every store

WD Red SN700 1TB NVMe SSD

  • BlueDogInkNew

    Availability unknown

    $137.87Observed at 4:31 AM
    Visit BlueDogInk
  • eBayNew

    Availability unknownSold by egoods.supply (99.9% positive, 26,600 ratings)Returns: Set by the eBay seller; the eBay Money Back Guarantee covers an item that doesn't arrive or isn't as described.

    $165.00Free shippingObserved at 4:30 AM
    Visit eBay
  • AmazonNew

    Availability unknown

    As an Amazon Associate, Deal.ai earns from qualifying purchases.

    $499.99Free shippingObserved at 4:30 AM
    Visit Amazon
  • WalmartNew

    Availability unknown

    $699.33Observed Nov 2, 2026, 8:23 AM
    Visit Walmart

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All 6 stores and price history →

SanDisk Ultra SSD

  • MelroseMACNew

    In stock

    $74.99Observed at 8:07 AM
    Visit MelroseMAC
  • PCNationNew

    Availability unknown

    $186.66Observed at 8:07 AM
    Visit PCNation
  • eBayNew

    Availability unknownSold by toprated-93 (98.7% positive, 422 ratings)Returns: Set by the eBay seller; the eBay Money Back Guarantee covers an item that doesn't arrive or isn't as described.

    $259.00+ $5.80 shippingVerified
    Visit eBay
  • serverblink.comNew

    Availability unknown

    $275.50Observed Nov 3, 2026, 7:13 AM
    Visit serverblink.com

Also available at

  • eBayCheck price at eBay
  • WalmartCheck price at Walmart

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All 14 stores and price history →

Specs compared

SpecWD Red SN700 1TB NVMe SSDSanDisk Ultra SSD
TypeInternalSSD
Form FactorM.2 22802.5 inch
ColorRedMulticolor
Read Speed3,400 MB/s560 MB/s
Write Speed2,900 MB/s write speed84K IOPS (random)
ConnectionM.2—
NVMeYes—
Release DateSeptember 2021—
Capacity2 TB—
Use—Internal
Device Compatibility—PC
Interface—SATA
Show all 35 specsShow fewer specs
SpecWD Red SN700 1TB NVMe SSDSanDisk Ultra SSD
Wireless Connectivity—No
Durability—Shock resistant, Vibration resistance
NVMe Support—No
PCIe Support—No
Cache—nCache 2.0
Data Encryption—No (256-bit encryption supported by controller …
Security Highlights—Hardware-based encryption
Design Highlights—Uses less power, 3D NAND provides greater endur…
Typical Users—Consumer

What reviewers say

WD Red SN700 1TB NVMe SSD

Owners generally rate the WD Red SN700 as a reliable, cool-running NAS drive that holds up under constant writes. Some note it is not the fastest drive and that sustained write speeds drop once the SLC cache fills.

What people mention
  • EndurancePraisedOwners value the high TBW rating for NAS and always-on workloads.
  • SpeedMixedSequential speeds are good for PCIe 3.0, but sustained writes fall off after the cache fills.
  • ThermalsPraisedThe drive runs cool and draws little power in NAS enclosures.
  • DRAM cacheCriticisedSome buyers note the lack of DRAM cache limits heavy random-write performance.

SanDisk Ultra SSD

  • 4.8 / 51,500 ratings

Rated 4.8 out of 5 from 1,500 ratings, buyers treat it as a reliable, easy SATA upgrade. Complaints center on it being slower than NVMe drives and on the missing encryption.

What people mention
  • SpeedPraisedOwners say it wakes up older machines and cuts boot times compared with a hard drive.
  • SATA limitCriticisedBuyers note it tops out near 560 MB/s and can't match NVMe drives.
  • InstallPraisedThe standard 2.5-inch format makes it a straightforward swap in most older PCs.

Questions and answers

Which is better for gaming?
The WD Red SN700. NVMe cuts load times and level streaming compared with SATA, and the gap shows most in large open-world games. The Ultra still works fine for games, just slower.
Will the WD Red SN700 fit my laptop?
Only if the laptop has an M.2 2280 M-key slot. Its single-sided design helps in thin chassis. If your laptop takes a 2.5-inch SATA drive instead, the SanDisk Ultra is the one that fits.
Which lasts longer?
The SanDisk Ultra publishes a 600 TBW endurance rating, which is high for a consumer SATA drive. WD does not publish a TBW figure for the SN700 in this listing, so on paper the Ultra has the clearer endurance claim.
Is the SanDisk Ultra worth stepping up to from the SN700?
Only if you need 4 TB in a SATA bay or a drive for an older machine. For speed, the SN700 is the step up, not the Ultra.
Can I use either drive as an external SSD?
Yes, both work in a USB enclosure, but the SN700 needs an NVMe-to-USB enclosure and the Ultra a SATA one. In an enclosure both are limited by USB bandwidth, which narrows the speed gap.
Does either drive encrypt my data?
The SanDisk Ultra's controller supports 256-bit encryption, but it is not enabled, so data is not encrypted out of the box. The SN700's encryption support is not specified. Use full-disk encryption in your OS for either.

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More comparisons

  • Sandisk WD Red SN700 Series 1TB M.2 2280 M-Key PCIe NVMe SSD Drive, single-sided (WDS100T1R0C) vs Crucial T500 4TB PCIe 4.0 NVMe M.2 SSD
  • Sandisk WD Red SN700 Series 1TB M.2 2280 M-Key PCIe NVMe SSD Drive, single-sided (WDS100T1R0C) vs WD_BLACK SN7100 M.2 2280 4TB PCI-Express 4.0 x4 TLC 3D NAND Internal Solid State Drive (SSD)
  • WD_BLACK SN7100 M.2 2280 4TB PCI-Express 4.0 x4 TLC 3D NAND Internal Solid State Drive (SSD) vs SanDisk Ultra SSD
Power Source
—
Hand-operated
Power Consumption—50mW (idle)
Removable—No
TBW (terabytes written) (TB)—600
Depth (")—3.957
Width (")—2.756
Placement—Internal
Size (GB)—4000
Height (")—0.276
Random Write 4KB (max) (IOPS)—82000
Sequential Write (MB/s)—530
Sequential Read (MB/s)—560
Random Read 4KB (max) (IOPS)—95000
hard_drive_capacity—4 TB
EncryptionCriticised
The controller supports 256-bit encryption, but it isn't implemented, which disappoints security-minded buyers.