# System Parameters

'VR'= | Verify Read

## Description

Verifies all data file reads by re-reading and comparing. The values set in 'VR' define the number of retries before a data read error is generated.

#### Note:
'VR' can be helpful in tracking down hardware-related data corruption problems. (There is some impact on system performance.)

TCB( ) returns the following values for this parameter:

> TCB(63) - Number of reads verified
> TCB(65) - Number of reads mis-compares

## Default

'VR'=0

## See Also

TCB( ) Return Task Information