Xbox Series X SSD was custom built by Microsoft for speed, flexibility

The Xbox Series X's new proprietary SSD was custom-built by Microsoft for fast loading times, intuitive functionality like expanded Quick Resume, and a virtual RAM memory cache for developers.

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Microsoft has confirmed our suspicions: The Xbox Series X will use a customized solid state drive tailor-made for the console. The next-gen Xbox's SSD is specifically designed to massively boost in-game load times and asset fetching speeds first and foremost, but it has some unique memory capabilities that enable new expansive features. Thanks to the new SSD, Quick Resume on the Xbox Series X will let you keep save states for multiple games at once. These save states also survive a hard system reboot.

In a recent Major Nelson podcast, Xbox director of program management Jason Ronald confirmed the next-gen Xbox will indeed use specially-made storage.

"We actually incubated Quick Resume in the Xbox One. Today you can actually Quick Resume the last game you played, but with Xbox Series X we're actually able to do that with multiple titles. We've basically taken this to the next level of capability."

"Quick Resume is really powered by our custom-built SSD that's part of the Xbox Series X, which actually allows us to have multiple games saved at any one time and then I can instantly jump in between them or jump into them and resume exactly where I was when I left off."

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That's not the extent of the Xbox Series X's functionality, though. Developers can actually use the next-gen SSD as a Virtual RAM buffer to help efficiently render scenes by optimizing the asset flow pipeline.

"We've created a new generation of SSD. We're actually using the SSD as virtual RAM. We're seeing more than 40x performance increases over the current generation," Microsoft said in the Project Scarlett E3 2019 reveal video.

"The combination of the SoC and the solid state drive are really what gives you a totally new experience."

"Now we can take all of that power and apply all of that back into the scene, and generate more life into that world and bring it to the gamer in a seamless way."

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Read Also: Xbox Series X SSD: DRAM-less PCIe 4.0 NVMe with up to 3.7GB/sec speeds

So how fast will the Xbox Series X SSD actually be?

Based on previous leaks from a Phison engineer, the Xbox Series X will actually be a DRAM-less solid state drive that likely uses QLC flash memory. This means the drive will be cheaper to make, and that the Xbox Series X will need to have some sort of on-board DRAM allocated specifically for the system storage.

The next-gen Xbox may use the Phison PS5019-E19T memory controller.

If it does use the E19T, the Xbox Series X's SSD can come up in to 2TB capacities, and theoretically deliver up to 3.75GB/sec sequential reads and writes, and hit up to 440K IOPS read and 500K IOPS writes.

That's roughly 36 times faster than the 100MB/sec average read/writes in the stock 5400RPM Xbox One hard drives. Which matches up with Microsoft's assertions of 40x current-gen storage performance.

Microsoft has yet to reveal specifics, but Phison did release a video on the E19T memory controller and specifically mentioned gaming consoles in the reel.

This brings us to the most important question: How will the Xbox Series X interact with current external hard drives? Lots of gamers keep their expansive gaming libraries on external HDDs, especially since you can't really swap out the Xbox One's internal HDD without a lot of annoyances.

Microsoft needs to address these worries ASAP and I expect we'll hear more at the company's big digital E3 2020 livestream.

Xbox Series X is due out by Holiday 2020. No pricing has been announced.

Check below for confirmed specs and details, and a huge content listing of everything we've heard about Xbox Series X so far:

Xbox Series X confirmed details (Formerly Project Scarlett):

• 8-core, 16-thread Zen 2 CPU
• 12 TFLOP Navi GPU on RDNA 2 architecture
• Highly customized 7nm SoC from AMD
• GDDR6 memory
• 2x Xbox One X's 6TFLOPs of GPU perf
• 4x CPU power of Xbox One generation
• Can deliver up to 40x more performance than Xbox One in specific use cases
• Adaptive sync supported
• Super-fast SSD that can be used as VRAM
• Supports 8K resolution (likely media playback)
• 120FPS gaming
• Variable refresh rate (adaptive sync/FreeSync)
• Variable Rate Shading
• Raytracing confirmed with dedicated raytracing cores
• Backward compatible with thousands of Xbox, Xbox 360, and Xbox One games
• New controller with a dedicated share button
• Compatible with Xbox One accessories

Lockhart (Unconfirmed lower-end Xbox Series hardware)

• 1440p 60FPS
• No disc drive
• Super-fast SSD that can be used as VRAM
• 7nm AMD SoC w/ scaled-down 8-core, 16 thread Zen 2 CPU at 3.5GHZ and Navi GPU
• Lower GDDR6 memory pool (Possibly 12GB)
• 4 TFLOPs of power?
• Aims to rival PS4 Pro/Replace Xbox One S
• Full backward compatibility with all Xbox One games
• Cheaper MSRP

Anaconda/Xbox Series X/Project Scarlett

• 4K 60FPS
• Disc drive with 4K UHD playback
• Super-fast SSD that can be used as VRAM
• 7nm AMD SoC with 8-core, 16 thread Zen 2 CPU at 3.5GHz and 12TFLOP RDNA 2 Navi GPU
• 16GB GDDR6 RAM
• 12 TFLOPs of power
• 2x GPU power as Xbox One X/aims to replace Xbox One X
• Full backward compatibility with all Xbox One games
• More expensive MSRP

Xbox Series X coverage:

• Xbox Series X's Smart Delivery game upgrades explained by Microsoft
• Xbox Series X may enhance Xbox 360, OG Xbox games too
• Xbox Series X's new Quick Resume function is revolutionary
• Microsoft: Xbox Series X's real magic is hardware and software synergy
• Xbox Series X enhancement patches will upgrade current-gen games
• Microsoft: Xbox Series X's real magic is hardware and software synergy
• Xbox Series X natively plays all Xbox games better
• Xbox Series X 12 TFLOP GPU confirmed, 4x Xbox One CPU and 8x GPU power
• Xbox Series X packs dedicated audio hardware acceleration
• How publishers will approach current-gen on PS5, Xbox Series X
• Xbox Series X and PlayStation 5 pricing expected to be $500
• Xbox studio using AI to upscale low-res textures in real-time
• Coronavirus may delay PlayStation 5, Xbox Series X launch past 2020
• Xbox Series X may support CFExpress memory cards
• Xbox Series X might support UltraWide monitors thanks to Samsung
• Xbox Series X CPU is the key to next-gen frame rates, Spencer teases
• China trade tariffs won't directly raise PS5, Xbox Series X prices
• AMD unknown APU: is this the mid-range Xbox Series S chip?
• Xbox Series X SSD: DRAM-less PCIe 4.0 NVMe with up to 3.7GB/sec speeds
• First photo of an Xbox Series X prototype has leaked
• Next-gen console exclusives will be few and far between through 2021
• No, Xbox Series X won't run Steam or the Epic Store
• Ex-Xbox VP won't buy next-gen Xbox, will play exclusives on PC instead
• Xbox Series X HDMI pass-through currently not supported
• New Xbox Series X renders show ventilation and back ports
• Xbox Series X new die shot teases beautiful AMD custom 7nm APU
• Analyst: $500 Xbox Series X will take wind out of Microsoft's sails
• PlayStation 5 to outsell Xbox Series X in 2020, analyst predicts
• Xbox Lockhart going digital-only at launch would be a mistake
• Xbox Series X new die shot teases beautiful AMD custom 7nm APU
• Xbox Series X will destroy PlayStation 5 with its MUCH faster GPU
• Xbox Series X rumor: launching November 22 for $499
• Xbox Series X GPU is better than any Navi GPU released so far
• Xbox Series X may be more powerful, but will third-party devs use it?
• Xbox Series X will boost performance of previous gen Xbox games
• PS5, Xbox Series X SSD may use software-defined flash to boost speeds
• Microsoft to 'virtually eliminate' loading times on Xbox Series X
• How the Xbox Series X will look in your living room
• Clarifying the Xbox Series X name
• Xbox Series X's custom SoC built with backward compatibility in mind
• Next-gen Forza is playable on Xbox Series X, is 'vastly different'
• Xbox Series X size comparison vs Xbox One, PS4 Pro, Switch
• Next-gen Xbox controller has a share button
• Xbox Series X naming scheme leaves door open for Lockhart
• Xbox Series X may allow suspend and resume for multiple games at once
• Microsoft reveals next-gen Xbox console, the Xbox Series X
• Xbox Series X may allow suspend and resume for multiple games at once
• Next-gen Xbox Lockhart has 'significantly less RAM' for 1440p gaming
• Next-gen Xbox Scarlett specs: 12TFLOPs, 16GB RAM, 3.5GHz Zen 2 CPU
• Cheaper next-gen Xbox Lockhart targets 1440p 60FPS
• Cheaper next-gen Xbox Lockhart targets 1440p 60FPS
• Project Scarlett devkits aren't widely available yet
• PS5, Xbox Scarlett SSD may use Optane-like ReRAM to supercharge speeds
• NVIDIA G-Sync monitors to improve PlayStation 5 and Xbox Scarlett
• Project Scarlett won't get VR gaming, Microsoft doesn't care about VR
• Next-gen Xbox Scarlett plays four generations of Xbox games
• Microsoft teases next-gen Xbox: 8K, 120FPS, super-fast SSD
• Xbox Scarlett CPU: 'no compromises', allows for 4K 120FPS gaming
• Microsoft: Xbox Scarlett will kick PlayStation 5's ass in perf/price
• Next-gen Xbox may hit 4K 60FPS in every game
• Project Scarlett to hit 1080p 120FPS gaming
• Project Scarlett trade-in program announced, but there's a big catch
• New Viking Assassin's Creed may be next-gen console launch game
• Next-gen Xbox may get room-scale VR gaming
• PS5 and Xbox Scarlett will both handle ray tracing differently
• Gears 5 developer says Xbox Scarlett has dedicated ray tracing cores
• GTA 6 on PS5, Project Scarlett to have insane hyper-realistic visuals
• AMD 'Flute': Xbox Scarlett SoC: Zen 2 8C/16T @ 3.2GHz on 7nm
• Project Scarlett's price isn't locked in yet
• Project Scarlett isn't the last Xbox console