Symptoms
- Format progress bar stays at the same percentage for a long time
- Format dialog becomes unresponsive
- Quick format that should take seconds is taking many minutes or hours
- Error appears partway through formatting
Likely causes
- CommonDrive has bad sectors the format process is struggling to work aroundA full (non-quick) format checks every sector, which takes far longer on a failing drive.
- CommonLoose or unstable USB connection dropping mid-formatA weak connection can interrupt communication during the process.
- PossibleVery large drive being formatted with a full format instead of quick formatFull formats on large drives can legitimately take hours.
- PossibleUnderlying drive failure making it unable to complete writesA dying drive can hang indefinitely trying to write to bad areas.
What to do
- Check whether 'Quick Format' was selected; an unchecked full format on a large drive can take hours normally.
- If it's been stuck at 0% or the same number for over 30–60 minutes, it's likely stalled.
- Cancel the format and reconnect the drive with a different, direct USB connection.
- Try a quick format instead of a full format to see if it completes.
- If quick format also hangs, run a drive health check tool to look for bad sectors or SMART warnings.
- If the drive shows failure indicators, stop trying to format it and consider it end-of-life for reliable use.
Tools and parts
- Drive health check tool
When to call a pro
If a drive won't format and shows SMART failure warnings, don't keep retrying; replace the drive rather than risk it failing entirely mid-use.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.