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Apple Computing Products:
macOS - Notebook Hardware
External hard drive with MacBook Pro
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<blockquote data-quote="MacInWin" data-source="post: 1796453" data-attributes="member: 396914"><p>It's not easy to forecast. When on mains power, if the power goes off the drive stops. If the drive was in the process of writing to the drive, it will most likely be corrupted but may be repairable with some utilities. If it was writing to the directory or partition map, it may be totally lost and require reformatting. But if it was idling, or just reading, it is most likely that no damage will occur. Because neither you nor I can forecast what the drive may be doing when the power fails, it is impossible to assess in advance what damage will be done. That's why it's wise to have a battery backup for drives, so that if/when mains fail, the drive keeps going long enough for you to take steps to quiet the drive by unmounting it and powering down the Mac.</p></blockquote><p></p>
[QUOTE="MacInWin, post: 1796453, member: 396914"] It's not easy to forecast. When on mains power, if the power goes off the drive stops. If the drive was in the process of writing to the drive, it will most likely be corrupted but may be repairable with some utilities. If it was writing to the directory or partition map, it may be totally lost and require reformatting. But if it was idling, or just reading, it is most likely that no damage will occur. Because neither you nor I can forecast what the drive may be doing when the power fails, it is impossible to assess in advance what damage will be done. That's why it's wise to have a battery backup for drives, so that if/when mains fail, the drive keeps going long enough for you to take steps to quiet the drive by unmounting it and powering down the Mac. [/QUOTE]
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Apple Computing Products:
macOS - Notebook Hardware
External hard drive with MacBook Pro
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