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EDSFF E1 Form Factor
KIOXIA Corporation provides next-generation PCIe® 4.0 data center NVMe™ SSDs with its XD6 and XD7P Series, which are designed to the Open Compute Project® (OCP) Datacenter NVMe™ SSD specification and available in E1.S form factors. There are a number of key reasons why these new EDSFF E1.S SSDs can enable a data center server architecture to adapt to changes, but the top five supported by KIOXIA include:
Higher Performance / Higher Power Budget vs. M.2 Devices: More than doubles the power budget versus M.2 devices, enabling E1.S SSDs to saturate PCIe® Gen4 performance.
Standardized Thermal Solutions: Improves interoperability across vendors and platforms while providing the flexibility to select the right balance of cooling and storage density through different E1.S heatsink options.
Improved Physical Serviceability: Vastly improves serviceability with hot plug support that no longer requires an entire server to be taken down in order to replace a single SSD.
Designed to Better Accommodate NAND Flash Memory Packages: Wider PCB design enables optimized orientation of the NAND flash memory packages, providing headroom for higher capacity drives.
Supported by Leading Hyperscalers: Meta™ and Microsoft®, leading authors of the OCP Datacenter NVMe™ SSD specification, are specifying E1.S designs on upcoming OCP platforms, promoting industry-wide adoption.
E1 - Hyperscale Servers and Storage


Type | Width | Length | Thickness (Height) | Max Power |
---|---|---|---|---|
E1.S 5.9 mm | 31.5 mm | 111.49 mm | 5.9 mm | 12 W |
E1.S 8 mm with heat spreader | 8.01 mm | 16 W | ||
E1.S 9.5 mm with symmetric enclosure | 33.75 mm | 118.75 mm | 9.5 mm | 20 W |
E1.S 15 mm with asymmetric heatsink | 15 mm | 25 W | ||
E1.S 25 mm with asymmetric heatsink | 25 mm | |||
E1.L 9.5 mm with symmetric enclosure | 38.4 mm | 318.75 mm | 9.5 mm | 25 W |
E1.L 18 mm with symmetric heatsink | 18 mm | 40 W |
EDSFF E1.S Use Cases
E1.S form factors are well-suited for these use cases:
E1.S 9.5 mm
Target System | Small footprint systems |
---|---|
Examples | Blade servers; Edge compute and storage systems; Dense, scaled servers |
Primary Need(s) | Performance; Excellent thermal capabilities |
Use(s) | 2.5-inch and M.2 replacement |
Typical Configuration | 6 to 12 E1.S SSDs |

E1.S 15 mm
Target System | 1U/2U/4U and special-purpose systems |
---|---|
Examples | Compute blades and systems; Performance and capacity-optimized storage systems; Artificial Intelligence/Machine Learning (AI/ML) and High Performance Computing (HPC) systems; Edge systems |
Primary Need(s) | Scalable performance and capacity; Optimized thermal performance |
Use(s) | 2.5-inch and M.2 replacement for boot and primary storage |
Typical Configuration | 2 to 32 E1.S SSDs |

E1.S 25 mm
Target System | 2U and larger systems |
---|---|
Examples | Storage appliances; Input/Output (I/O) and storage-rich servers / databases; Performance-oriented storage systems |
Primary Need(s) | Scalability of performance with capacity; Lower cost per performance |
Use(s) | Mainstream 2.5-inch replacement |
Typical Configuration | 36 to 64 E1.S SSDs |

KIOXIA EDSFF E1 Offerings
XD6 E1.S

XD7P E1.S

Product | Form Factor | Endurance | Interface | Storage Capacity (GB) | Sequential Read/Write | Random Read/Write |
---|---|---|---|---|---|---|
XD6 | EDSFF E1.S | Read Intensive (1 DWPD for 5 years) |
PCIe® 4.0, NVMe™ 1.3c | 1,920 3,840 |
Up to 6,500/2,350 MB/s |
Up to 880K/90K IOPS |
XD7P | PCIe® 4.0, NVMe™ 2.0 | 1,920 3,840 7,680 |
TBD | TBD |