When purchasing wholesale SATA hard disks, you must prioritize Interface Speed (SATA 3.0 6Gb/s) to ensure compatibility with modern systems. Evaluate the Rotational Speed (RPM), typically 7200 RPM for high-performance desktops or 5400 RPM for energy-efficient storage. Additionally, check the Cache Size (e.g., 64MB, 128MB, or 256MB) as larger buffers significantly improve data transfer stability. For enterprise-grade needs, verify the MTBF (Mean Time Between Failures) rating, which should ideally be 1 million hours or higher.