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About Check File System
When running computer, users may receive a message that indicates there is a damaged file system or the partition need formatting before access which might be caused by abnormal shutdown. At this time, users may try to repair the error by employing the Check File System function which aims to checking and repairing some mistakes to ensure the integrity of the file.

See the MiniTool Partition Wizard Tutorial to know how to complete this task.

After the main process I check the card again with fsck. To check bad blocks I also tried the '-c' switch, but I always get a return value!= 0 and the message 'FILE SYSTEM WAS MODIFIED' (see below). I get the same result when checking the very same drive several times.
Checking file system on C: The type of file system is FAT32 One of your disks needs to be checked for consistency. You may cancel the disk check, but it is strongly recommended that you continue. 'checking file system on c: the tye of the file sistem is FAT32 one of your disks needs to be checked for consistency. You may cancel the disk check, but it is strongly raccomended that you continue. Two ways: 1: Look in the./Windows/System32 folder for a file called 'ntoskrnl.exe'. If this file exists, it is at least an NT based system. (I assume you are not looking for Win95 or earlier.).

How to Check File System

Step 1. Launch MiniTool Partition Wizard to its main interface. Then select the target partition, and choose Check File System from the action panel or from the Partition menu.
Checking File System On C Vista
Step 2. A new window pops-up with two options: Check only and Check & fix detected errors. If users only want to check, select the former one; if users want to repair mistakes during the checking process, select the latter one. After that, click Start button and MiniTool Partition Wizard will check/fix file system immediately.
