A disk I/O error (I/O stands for Input/Output) means a Windows operation to read from or write to a drive failed. It can appear as an error dialog, an application crash, or a "The request could not be performed because of an I/O device error" message in Windows.
Part 1. What Causes a Disk I/O Error
| Cause | Symptoms |
|---|---|
| Loose or failing cable | Intermittent I/O errors on external drives |
| Faulty USB port or hub | Errors only on specific ports |
| Bad sectors on the drive | Errors on specific files or folder areas |
| Outdated or corrupted driver | Consistent errors on one drive |
| Drive firmware bug | Errors after system or firmware update |
| Physical drive failure | Clicking sounds + I/O errors |
| Drive not receiving enough power | Errors under load, especially 3.5" drives |
⚠️ Important: A disk I/O error on an internal drive — especially with a clicking sound — may indicate physical failure. Do not run CHKDSK on a clicking drive. Instead, immediately back up files and consider data recovery before the drive becomes undetectable.
Part 2. Try These Fixes First
Step 1 — Swap the cable: Replace the USB, SATA, or Thunderbolt cable connecting the drive. A damaged cable is one of the most common causes of I/O errors and the easiest fix.
Step 2 — Try a different port: Connect the drive to a different USB or SATA port. Faulty ports cause intermittent I/O errors even with healthy drives.
Step 3 — Test on another computer: Connect the drive to a different PC. If the I/O error disappears, the issue is with the original computer's port, driver, or settings.
💡 Tip: For external drives showing I/O errors, bypass any USB hub and connect directly to a rear motherboard USB port. Hubs reduce available power and may not provide stable enough power for drives that draw more current under load.
Part 3. Run CHKDSK to Fix Logical I/O Errors
If the cable and port are confirmed good, CHKDSK can repair file system errors that cause I/O errors:
chkdsk E: /f /r
(Replace E: with your drive letter)
After CHKDSK completes, reconnect the drive and check if the I/O error has resolved.
💡 Tip: Run
chkdsk E:(without /f or /r) first for a read-only assessment. If it reports multiple bad sectors, prioritize data recovery over CHKDSK repair — a drive with many bad sectors may be physically degrading.
Part 4. Check SMART Health and Drive Status
Use CrystalDiskInfo to read the drive's SMART health data:
| SMART Attribute | Concern Level | Action |
|---|---|---|
| Reallocated Sectors Count rising | High | Back up immediately |
| Current Pending Sectors > 0 | High | Run recovery software |
| Uncorrectable Sector Count > 0 | Critical | Professional recovery |
| Drive temperature consistently high | Moderate | Improve ventilation |
| All attributes green | Low | Driver or cable issue |
💡 Tip: In CrystalDiskInfo, focus on the "Health Status" field at the top. Yellow means caution, red means bad — back up immediately when you see yellow. Green is acceptable but still check Reallocated Sectors Count: any non-zero value means the drive has been silently replacing bad sectors.
🗣️ r/techsupport guidance: "Got disk I/O errors on an external drive. Swapped the USB cable and errors stopped immediately. Always check the cable first — it's the most common cause and the easiest fix."
🗣️ r/datarecovery tip: "When I/O errors appear on an internal hard drive, check CrystalDiskInfo's SMART data before doing anything else. If Reallocated Sectors are above zero and climbing, the drive is physically failing — recover files now, replace the drive after."
Part 5. Recover Files From a Drive Showing I/O Errors With Ritridata
If I/O errors persist and the drive shows SMART warnings, recover your files before the situation worsens. Ritridata can scan drives with I/O errors and recover files from accessible sectors — on both Windows HDD/SSD and external drives.
Step 1 — Select the drive showing I/O errors from the list
Step 2 — Run a safe scan — read-only, the drive is not modified
Step 3 — Preview and recover files to a healthy drive immediately
FAQ
What does "The request could not be performed because of an I/O device error" mean? Windows failed to complete a read or write operation on the drive. The drive was detected but the data transfer failed — due to a cable issue, bad sectors, driver problem, or physical drive failure.
Can I fix a disk I/O error without losing data? If the cause is a cable, port, or driver issue — yes, no data is at risk. If the cause is bad sectors, CHKDSK can repair the file system without deleting files. If the cause is physical drive failure, data recovery should happen before any repair attempt.
Will replacing the cable fix a disk I/O error? In many cases, yes. A degraded USB or SATA cable causes intermittent communication failures that Windows reports as I/O errors. Swapping the cable is the fastest first step and costs nothing.
Is a disk I/O error the same as a bad sector? Not exactly — bad sectors can cause I/O errors when Windows tries to read them, but I/O errors can also result from cables, drivers, or ports with no bad sectors present. Check SMART data with CrystalDiskInfo to determine whether bad sectors are involved.
Can I recover files from a drive with I/O errors? Yes — as long as the drive is detected and not physically failed, recovery software can read the accessible sectors and recover files from them. Act quickly — deteriorating drives can become completely undetected with little warning.