Try checking the S.M.A.R.T. status with smartctl -H /dev/sda but if a disk is developing bad sectors I no longer trust it and immediately begin moving data to somewhere else.

"I think my fan is broken could that have damaged the disk?"

Heat could have. The S.M.A.R.T. results should talk about heat if that's been an issue.

See https://en.wikipedia.org/wiki/S.M.A.R.T.#Known_ATA_S.M.A.R.T._attributes for info on what various things mean especially the ones colored pink.

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