I'm currently using a 2013 21.5inch iMac booting windows 10 from an external SSD, crystaldiskmark reports the internal Apple HDD has a bad read error rate and that means it's on it's last leg. My question is when the internal HDD fails can I still boot from the external SSD via the boot menu or do I need to replace the HDD?
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IMG_8519 by Clive Viagas, on Flickr
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