You're copying files off your WD My Passport, you bump the table, the USB cable yanks out, and when you plug it back in, the drive shows a warning: SMART Status BAD. The drive might still open, files look fine, but Windows or Western Digital's Dashboard throws that red flag. This usually happens right after a physical shock — a drop, a yank, or even a sudden power loss — and it's scary because you don't know if the drive is dying or just grumpy.
The root cause is the drive's Self-Monitoring, Analysis, and Reporting Technology (SMART) system. It tracks things like bad sectors, spin-up time, and temperature. When a drive takes a hit, the read/write head might scrape the platter, leaving a few damaged sectors. The firmware counts those as pending or reallocated sectors. If the count crosses a threshold, SMART flips to BAD. The drive isn't instantly dead — most of the time it still works — but that flag means the firmware has lost confidence in the media.
The fix isn't a magic software that makes the warning go away. It's about finding out how bad the damage is and then either remapping the bad sectors or deciding it's time for a new drive. Here's the step-by-step I use with my own drives.
Step 1: Back up the drive immediately
Before you touch anything else, copy every file you need off that drive. Do not run chkdsk yet — chkdsk can stress a damaged drive and make things worse if it's on its last legs. Just drag-and-drop the important stuff to your internal drive or another external. If the drive fails during the copy, you'll lose less data than if you'd skipped this.
Expected result: You finish the copy with maybe a few files that won't copy. Those are the ones sitting on the damaged sectors. Keep a note of which ones failed.
Step 2: Check SMART attributes with a real tool
Windows doesn't show SMART details, so grab a tool like CrystalDiskInfo (free) or WD Drive Utilities (if you have a WD). Install CrystalDiskInfo and open it. Find your My Passport in the list. Look at these two attributes:
- 05 Reallocated Sectors Count — the number of sectors the drive has already swapped out for spares.
- C5 Current Pending Sectors — sectors that look suspicious but haven't been remapped yet.
If C5 is anything above zero, that's your trigger. If 05 is also climbing, the damage is spreading.
Expected result: You'll see numbers like "0" or "1" or maybe "100". If it's under 10, you've got a chance. If it's in the hundreds, the drive is on life support.
Step 3: Run chkdsk to force remapping
Now that you have a backup, you can try to get the drive to reallocate those pending sectors. Open Command Prompt as Administrator (search for "cmd", right-click, "Run as administrator"). Type this, replacing E: with your drive letter:
chkdsk E: /rThe /r flag finds bad sectors and recovers readable data. It also tells the drive to mark those sectors as bad and move the data to good spares. This takes a while — think hours for a 1TB drive. Let it run overnight.
Expected result: At the end, you'll see a summary like "Windows has corrected the file system" or "0 KB in bad sectors". If it says "unable to correct", those sectors are toast, and the data on them is gone.
Step 4: Re-check SMART after chkdsk
Open CrystalDiskInfo again. The C5 count should have dropped to zero if chkdsk successfully remapped the sectors. The 05 count might have risen — that's normal, it's the spares being used. The SMART status might still say BAD though, because the firmware remembers the incident. That's a permanent flag in some drives; it won't clear just because the sectors are fine now.
Expected result: C5 = 0, 05 = some small number (like 4 or 8). The status light might stay red or yellow. That's okay for now, but keep an eye on it.
Step 5: If the status still shows BAD and C5 is still above zero
If chkdsk didn't clear the pending sectors, or if the reallocated count is climbing on every scan, the drive is physically damaged and it's not going to get better. The firmware is trying to hide the damage, but the platter surface is scratched. Replace the drive. Copy what you saved in Step 1 to the new one, and don't trust the old one for anything important again.
Also, if you dropped the drive hard enough to hear a click or if it makes a grinding sound when spinning, skip chkdsk entirely. That's a mechanical failure, not a sector issue. Unplug it and call a data recovery service if the data is worth more than the drive.
What to check if it still fails
If SMART still says BAD and chkdsk won't complete, here's the short list:
- Is the USB cable snug? A loose connection can cause power drops that mimic a failing drive.
- Is the drive getting enough power? Some USB ports don't deliver enough; use a powered hub or a different cable.
- Run WD's own Diagnostics (in WD Drive Utilities) — it does a more thorough test than chkdsk. If it fails, that's your answer.
The honest truth is that a SMART BAD flag after a physical shock is usually a death sentence. The drive might limp along for months, but it'll never be as reliable as before. I've seen too many people ignore the flag and lose everything a week later. Back up, test, and if the numbers don't look right, move on.