Guest amarmot Posted March 16, 2022 Posted March 16, 2022 This post closely follows a previous ASC thread: Large hard drives won't mount after resta… - Apple Community I have had a very similar problem with a Mac Pro 5,1 (2012), running either Yosemite (10.10.5) or High Sierra (10.13.3) off of SSD or HDD. Upon restart or option-restart, the system will not mount the following disks: 6TB WD Black WD6002FZWZ 8TB HGST He8 HUH728080ALE600 8TB WD Red (white labeled OEM version WD80EMAZ) Other details: - On cold boot or option-boot, all of these drives... Read more Source: MacRumors
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