Hi Arhaan, Welcome to Seven forums.
Drive Calibration Retry Count :ar: Number of attempts to calibrate a drive
Indicate problem with motor, bearings or power supply.
Current Pending Sector Count :ar: Count of unstable sectors
These pending sectors may be remapped to the spare area.
Critical attribute
source
I would suggest to scan the drive with hard drive's manufacturer's tool. BTW, which HDD are you using?