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U.3 到底是不是 U.2？先拆掉两块命名迷雾
迷雾一：U.3 和 U.2 是两个不兼容的接口。 实际上 U.3（SFF-TA-1001）是 U.2 的演进标准：U.3 盘可以插入 U.2 槽位工作（向后兼容），而 U.3 盘位同时为未来的 EDSFF（E1.S/E3.S）形态预留了兼容路径。这意味着你的 U.2 服务器今天就能用上 U.3 盘，无需换平台。
迷雾二：PCIe Gen4 SSD 在 Gen5 服务器时代已经过时。 对绝大多数数据库、虚拟化和云负载，峰值带宽并不是瓶颈——QoS 延迟才是。ミクロン 7450 PRO 的 99.9999% 读延迟不超过 2ms（4KB 混合随机负载），对事务型应用的意义远大于多出的顺序带宽，而 Gen4 的每 TB 成本明显低于 Gen5。这是 Micron 官方把 7450 定位为主流数据中心主力的原因。
Core Specifications
| 属性 | 仕様 |
|---|---|
| インタフェース | PCIe Gen4 x4, NVMe 1.4 |
| NAND | Micron 176-layer 3D TLC (CMOS under Array) |
| Form factors | U.3 7mm/15mm, E1.S 5.9/15/25mm, M.2 22×80/22×110 |
| 容量 (U.3) | 960GB / 1.92結核 / 3.84結核 / 7.68結核 / 15.36結核 |
| Sequential read / write | 6,800 MB/s / 5,600 MB/s (7.68結核) |
| Random read / write | 1,000,000 / 215,000 IOPS (7.68結核, 4K) |
| Typical latency | 80 us read / 15 us write |
| 持久力 | 1 DWPD; 14,000 TBW (7.68結核), 28,000 TBW (15.36結核) |
| 信頼性 | MTTF 2,000,000 device hours; ウーバー <1 sector per 10^17 bits |
| 力 | U.3: 12.1 W seq read / 16.6 W seq write |
| 温度 / warranty | 0-70 C operating / 5 年 |
176-Layer NAND and Gen4 Performance
The 7450 PRO pairs Micron’s 176-layer 3D TLC NAND with a Gen4 controller to deliver up to 6,800 MB/s sequential read and 5,600 MB/s sequential write on the 7.68TB U.3 model, と 1,000,000 random read IOPS and 415,000 IOPS on 70/30 mixed random workloads. The simplified read algorithm and metal control gate NAND improve 99.9999% QoS read latency for small (4KB) mixed random workloads – the profile that SQL Server, オラクル, MySQL, RocksDB, Cassandra and Aerospike actually generate.
Form Factors and Capacity Options
The 7450 family spans the broadest Gen4 form-factor range in the industry:
- U.3 7mm/15mm – standard 2.5-inch data center drive, U.2 backward compatible, dual z-heights broaden chassis options.
- E1.S 5.9/15/25mm – EDSFF form factor optimized for 1U platforms, including an industry-leading 7.68TB E1.S option for high-density NVMe.
- M.2 22×80/22x110mm – ultra-compact boot drives with Power Loss Protection, designed for server boot duty.
Capacities run from 400GB to 15.36TB, まで 128 namespaces for multitenancy, 512/4096-byte sector support and TAA compliance for US Federal procurement.
安全: Secure Execution Environment
The 7450 PRO ships Micron’s unique Secure Execution Environment – an isolated security processor inside the SSD controller that physically separates security functions from the main data path. Around it: asymmetric roots of trust in immutable ROM (revocable), NIST-approved RSA 208/3072-bit key support, RSA delegation keys for customer key ownership, セキュアブート, key-based firmware updates (public-key authenticated) and key-based privileged access control. SED variants provide TCG Opal 2.01 / IEEE 1667, and the family is FIPS 140-3 レベル 2 certified for regulated deployments.
持久力: What 1 DWPD Really Buys
1 Drive Write per Day on a 7.68TB drive means you can overwrite the entire drive daily for the 5-year warranty period – 14,000 TBW. On the 15.36TB model that doubles to 28,000 TBW. For read-heavy mainstream workloads (仮想化, データベース, cloud and object storage, VDI), that budget is rarely approached; write-heavy tiers should step up to the 7450 MAX (3 DWPD). Power Loss Protection and Data Path Protection ensure in-flight data survives power loss and bit errors are caught from PHY to NAND.
Buying FAQ
- Is U.3 compatible with my U.2 server? はい – U.3 drives are backward compatible with U.2 slots.
- PRO or MAX? PRO = 1 DWPD read-intensive; MAX = 3 DWPD mixed-use for write-heavy tiers.
- 暗号化? SED (TCG オパール 2.01 / IEEE 1667) and FIPS 140-3 レベル 2 options available.
- Best-fit workloads? SQL/NoSQL databases, VDI, サーバー仮想化, cloud and object storage, boot/cache tiers.
- 保証? 5 年, backed by Micron’s enterprise SSD program.
Pairing it with a server? The Dell PowerEdge R760 までサポートします 24 x NVMe U.2 or 16 x E3.S Gen5, and the xFusion 2288H V7 まで 28 × NVMe. As an authorized distributor we offer factory-direct pricing, 3-year warranty on servers, global shipping and free configuration consultation – contact us for volume pricing.
