Unable to detect and open the HARD drive

Hello. I have a Seagate 1 TB external hard drive. And my mac is running on the latest OS, I was still able to connect and open my hard drive on my mac, but after reboot my macbook only once after an update, I can access is no longer my hard drive. Why is it so? Is that what I can do to re - open and use my hard drive as usual?

Restart and hold down command + R, this will take you to the recovery, you can test and repair the hard drive.

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