Do not execute or open any associated file. Run a full antivirus/anti-malware scan (e.g., Malwarebytes, Windows Defender Offline, or ESET Online Scanner). If possible, isolate the affected device from the network and consult a security professional.
In the standard SCAN algorithm, the disk arm moves in one direction (e.g., towards the higher cylinder numbers) servicing requests until it hits the end of the disk. Then it reverses direction. This creates a fairness issue: requests located at the beginning or the end of the disk might have to wait longer, and requests just behind the arm's current position have to wait for a full sweep to the end and back. d.cscan.c0
Please provide more context, and I will do my best to help. Do not execute or open any associated file