Question HDD health at 91%

Mar 20, 2019
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Hi. My primary hdd is almost 2 years old and i never checked it's health. Yesterday i bought a second hdd and decided to run hdd sentinel my new hdd has 100% health but the older one is at 91%. I dont know if its health was that much from the start since iam only checking it now, is that a sign of hdd failure? how can i increase the health? this is what hdd sentinel says.

"935 errors occurred during data transfer.
At this point, warranty replacement of the disk is not yet possible, only if the health drops further.
In case of sudden system crash, reboot, blue-screen-of-death, inaccessible file(s)/folder(s), it is recommended to verify data and power cables, connections - and if possible try different cables to prevent further problems.
More information: https://www.hdsentinel.com/hard_disk_case_communication_error.php
It is recommended to examine the log of the disk regularly. All new problems found will be logged there.

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