A nearline hard drive is a high-capacity disk built for data centres: it sits “near the line”, close enough to be called on when needed, but far cheaper per terabyte than a fast drive. HDD just means hard disk drive — the mechanical kind with spinning platters.
近线硬盘
| Move变动 | Where it appeared出现位置 | What it means这句话在说什么 |
|---|---|---|
| — | Toshiba just announced a $400 million factory plan. Seagate lost billions in market value. 近线硬盘 · 第 1 张术语卡 | Why it matters here ▸ this is the exact product Toshiba says it will make twice as much of, and the exact product Seagate has already sold out for 2026. 为什么是「近线」：企业存储分三层——热数据（SSD，最快最贵）、近线（大容量 HDD，存放不常访问但不便删除的数据）、离线（磁带归档）。AI 训练语料、模型输出日志、云备份大多落在近线层，因此 AI 越热，近线硬盘越紧俏。对照数字：SSD 单位容量成本约为 HDD 的 20 倍，这是硬盘至今没被替代的根本原因。 |