"Check Disk" checks the reading of hard disk, floppy disk, memory card, etc. connected to the Windows PC.
It can be used to check if there are any read failures on the disk, and to check if all the data on the disk is zero after erasing.

*"Disk" refers to a whole physical disk unit.
*"Drive" refers to a partition within a disk drive. Usually a drive letter "A"-"Z" is assigned.



* This function is equivalent to "Verify after erase" when "Erase disk".
* This process does not change any data on the disk / drive.
* You may also be able to check the system drive (C: drive, etc.).

Select Disk/Drive




Select whether to check on a drive (C,D,..., a partition) or on a whole physical disk.


check Drive
In Windows, drive letters such as A, C, D, etc. are basically assigned to each disk (whole physical disk) for removable disks (such as floppy disks ,USB flash drives), and to each partition for hard disk drives.
If you want to check this drive unit, select "check Drive".
* on WindowsPE, you cannot select "check Drive"


check Disk
For hard disk drives, etc. (include removable drive), you can check entire disk regardless of the partition state. In that case, all data on the disk, including partition information, will be checked.

* For a single disk, it is a physical disk unit, and for a RAID configuration, it is a logical disk unit.

Disks with no drive letter assigned or unformatted disks can also be selected.

Select Drive/Disk to check

After specifying "check Drive" or "check Disk", select the drive/disk to check.

Disk information

See "Erase Disk".

Disk Detail information

See "Erase Disk".

Additional information for "Report"

See "Erase Disk".


Options

Select processing option.




Stop when error
If a read error to the disk occurs in the middle, you can choose to interrupt the process or ignore it and continue. If you ignore it and continue, the number of errors is counted.

Stop when non-zero
The disk is read sequentially, and if there is a non-zero location, the process is interrupted.
If it is not interrupted, it will be counted up and displayed as VR (Verify Error).

However, if you select "Compare with 1st sector" in the following options, it will be compared with the contents of the first sector instead of zero, and if there is a difference, interruption / VR(verify error) count up will be performed.

Compare with 1st sector
Checks if the contents of the disk are the same as the contents of the first sector.
This is used to verify a disk that has a specific pattern written on it, rather than zero. In "Enhanced Secure Erase", a specific pattern may be written.
First, the first sector (512 bytes) is read, and the subsequent sectors are compared in units of 512 bytes.
The count displayed as VR (Verify Error) is the number of sectors with different contents from the first sector.

Execute CHECK

Press this button to start the process.

Errors that can occur at the start

Disk is locked (Secure Locked)
Since the HDD password is set on the disk, read / write processing cannot be performed.
To cancel, use "Remove HDD Password" in "Boot up Erase Program"/"Utility".

Cannot lock drive/Cannot open drive
The specified drive / disk cannot be opened. Lock processing for exclusive use is not possible.
It is displayed when the program or file on the drive / disk is used by any process, including the case where the folder is displayed in Explorer.

For removable media such as USB flash drive, try removing it once. Check if the files are not used on the hard disk, including the service program in the background.

Display during erasure

You can check the start / end time and the number of errors.

RD: count of READ errors
VR: count of VERIFY errors

About the count of errors

The number of errors is counted for each of read, and verify.
The unit is the number of sectors per sector = 512 bytes.

READ error	This is the number of cases that could not be read. The contents of the disk are unknown for this number x 512 bytes.
VERIFY error	Only when read verification is performed. The number of sectors where the read data had a non-zero value. Or not same as the 1st sector, when "Compare with 1st sector" is selected. The part of the READ error is not included in the VERIFY error.

Interrupt

You can interrupt the process with the "Interrupt" button at the bottom right.

Report

When the process is completed, the following End "Report" will be displayed.
For details, see "erase Disk".


Close

Click the "Close" button to close the Report screen.