The File or Directory is Corrupted and Unreadable Error On iSCSI Lun Folder

I – A Folder in Qnap iSCSU Lun Starts to Give “The File or Directory is Corrupted and Unreadable ” And Cannot Access Data Anymore!

II – Why This Problem Appears? 

III – How to Fix “The file or directory is corrupted and unreadable” Error With “chkdsk /f h:”Command

IV – What to do To Stop This Problem For Future Cases? Create Block Base Lun, Disable RAID Scrubbing, Dont Shut Down NAS With Power Button Direclty!

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I – A Folder in Qnap iSCSU Lun Starts to Give “The File or Directory is Corrupted and Unreadable ” And Cannot Access Data Anymore!

Symptom of “The file or directory is corrupted and unreadable” error

Sometimes, when you plugged in an external hard drive, USB flash drive, SD card or some other storage devices into your computer runs Windows 10/8/7/XP/Vista or some other previous versions, Windows prompts error message: “Drive H:\ is not accessible. The file or directory is corrupted and unreadable.” If you check the file system of the device, you are likely to find that it is RAW file system.

the-file-or-directory-is-corrupted-and-unreadable

When location is not available error with “The file or directory is corrupted and unreadable” message happens, you can not access your device and might end up with huge data loss at most times. To avoid the disaster, next, we will show you how to fix the error in Windows 10/8/7/XP/Vista with 3 simple steps.

.https://www.easeus.com/resource/file-or-directory-is-corrupted-and-unreadable.html

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II – Why This Problem Appears?

Dont Shut Down NAS While A Backup Software Writin Data on Your Luns! Else Folder Maybe Corrupted!

If you unplug a removable disk from the computer without using Safely Remove while the drive is transferring or reading data, you will risk losing vital files system information. This is one of the most common reasons for “The file or directory is corrupted or unreadable” error.

Cause 1. MFT or FAT corruption

MFT is short for Master File Table and is included in NTFS file system. It contains all the information about a file such as file size, creation time, and access permissions. Like MFT, FAT (File Allocation Table) is included in FAT file system. It tells operating system where the file is store. Thus FAT or Master File Table corrupted will make system won’t be able to access data from the NTFS or FAT partitions.

Cause 2. Virus infection

When your computers, USB flash drive, memory card get infected with virus, the file system might be corrupted and shows “The file or directory is corrupted and unreadable” error.

Cause 3. Physical issues

Hard drive, USBs, flash drive or memory card can be corrupted on account of bad sectors which are no longer accessible or writable due to permanent damage. Partition information such as file system usually saved on specific location. If this location includes bad sectors then the operating system will fail to access data. Then you’ll get “The file or directory is corrupted or unreadable” error message.

.https://www.easeus.com/resource/file-or-directory-is-corrupted-and-unreadable.html

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III – How to Fix “The file or directory is corrupted and unreadable” Error With “chkdsk /f h:”Command

How to fix “The file or directory is corrupted and unreadable” error

Step 1. check and repair disk errors or corrupted file system

Checking and repairing disk errors and file system can fix “The file or directory is corrupted and unreadable” error caused by bad sectors, virus infection or file system corruption.

To do it using CHKDSK command line in CMD:

1.Click on Start –> Run –> Type cmd and press Enter to open cmd command Command Prompt.  
2.Enter the below command: chkdsk /f h: –> Press Enter. (Here h is the drive with which you have problem)

To do it with EaseUS partition tool:

In some special cases, Chkdsk might not work as well as expected. When it happens, you can try EaseUS partition tool to do the job.

1. Launch EaseUS partition tool, right-click the inaccessible partition and choose “Check partition”.

2. Choose the way that you want to use to check partition: “Check Partition Properties”, “Call Windows Chkdsk to fix errors”, “Surface Test”.
Click “OK”.

3. Let the software automatically check and repair hard disk partition errors. Finally, click “OK” to finish the process.

check-partition-4

Step 2. Recover data from “The file or directory is corrupted and unreadable” error

If you CHKDSK cannot help, you can choose to recover your data and then format the disk for reuse. EaseUS free data recovery software is recommended. Being able to recover data from hard drive with bad sectors, virus, corrupted file system or deleted/damaged unreadable file directory, it is the best solution to protect your important data from the possible data loss disaster that caused by “The file or directory is corrupted and unreadable” issue.

For a detailed guide, please refer to: how to recover data from the file or directory is corrupted or unreadable error

Step 3. Format disk to fix “The file or directory is corrupted and unreadable” error

After retrieving all your data, you can use EaseUS partition software to format the disk to permanently remove “The file or directory is corrupted and unreadable” error.

1. Connect the questioned disk to PC, launch EaseUS partition tool, right-click the disk and choose “Format partition”.

2. A mini window pops out, on which you can edit the partition label and choose a file system.

format-partition-3

3. Click “Apply” to confirm to format the disk to make it work properly.

 DownloadWin Version

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IV – What to do To Stop This Problem For Future Cases? Create Block Base Lun, Disable RAID Scrubbing, Dont Shut Down NAS With Power Button Direclty!

1 – Please use Qnap Block Base Luns! (not File Base)

Qnap block base lun

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2 – Please Disable RAID scrubing.. Thic may cause data corruption if a data is written on NAS while RAID scrubbing starts!

qnap raid scrubbing

3 – Most Inportant thing, Dont shut down NAS while a Camera Recording or a Backup Job is Running. This cause your luns turn into “RAW” file system.

Qnap shutdown

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