RAID-Z2 uses two disks for parity.
RAID-Z2 将两个磁盘用于奇偶校验。
At a minimum, a RAID-Z2 setup should be configured with five drives total (two used for parity) which will leave three drives to be counted as overall storage.
RAID -Z 2安装的最低要求是应该配置5个驱动器(两个用于奇偶校验)，剩下三个驱动器全部用于存储。
Method Z2 - intermediate casing end face with top view door.
Z 2制法——中间机壳端面带有上端检视门。
Servo motor drives the whole wheel head sliding board (Z1, Z2 axis) doing longitudinal running through ball screw.
砂轮架滑台移动(Z 1、z2轴)采用伺服电机带动滚珠丝杠、驱动整个砂轮架滑台的方式。
Zone 2 (Z2) – sometimes called no man's land, this zone is just above 80% HRmax but is not hard enough to be a real quality session (>85% HRmax).
区间2（Z2）-有时称为“无主之地”。该区域刚好超过80%最大心率，但又不足以达到真正的高强度区（大于85%最大心率）。
Zone 2 (Z2) – sometimes called no man's land, this zone is just above 80% HRmax but is not hard enough to be a real quality session (>85% HRmax).
区间2（Z2）-有时称为“无主之地”。该区域刚好超过80%最大心率，但又不足以达到真正的高强度区（大于85%最大心率）。
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