How can I deal with a 300 SMART Hard Disk Error at startup?
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MellowPine47
After resizing my disk partitions, my laptop began showing a 300 SMART Hard Disk Error every time it boots. The system still starts, and a disk-health check reports that the SSD is in good condition. Is there a safe way to identify the cause or stop this warning from appearing?
Answers
If the operating system and SMART utility both say the drive is healthy, record the exact error screen and run an extended test from the laptop manufacturer. The warning could come from another storage device, a stale diagnostic result, or a controller/firmware issue. Avoid repeated partition changes until your data is backed up.
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You may be able to dismiss or disable the notification in the BIOS or hardware-diagnostics settings, but that only hides the symptom and does not repair the drive. First create a full backup or disk image, then check for a BIOS or firmware update and run the laptop maker’s storage diagnostics. If the warning returns, replacing the drive is preferable to suppressing it.
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Make sure you’re checking the same physical drive that is triggering the warning. If the laptop has multiple drives, the diagnostic may be reporting a different device than the SSD you tested. Run the manufacturer’s boot-time storage test and review the exact model and SMART attributes. A general “Good” status can sometimes hide an individual warning value.
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A 300 SMART error usually means the drive’s firmware or the laptop’s built-in diagnostics detected a potential storage failure. Partition resizing normally doesn’t create a SMART error, so the timing may be coincidental. Check the drive’s detailed SMART attributes with a tool such as CrystalDiskInfo, but back up important files before doing anything else. If the warning is confirmed by the drive’s own health data, replacement is the safest fix.
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MellowPine47: I checked the SSD and its health is reported as good. I’m mainly trying to stop the warning from appearing during every boot.