External storage: Managing hardware damage and choosing between HDD and SSD

When an external hard disk drive (HDD) is dropped, it should be disconnected immediately rather than tested. Because HDDs rely on mechanical parts, such as read/write heads moving nanometers above spinning magnetic platters, a physical shock can misalign these components. Reconnecting a damaged HDD can cause the heads to scratch the platters, leading to permanent and irreversible data loss as debris spreads during rotation.

Choosing between an HDD and a Solid State Drive (SSD) involves weighing speed, price, and durability. SSDs use flash memory without moving parts, making them more resistant to physical shocks, though they are significantly more expensive per terabyte. While manufacturers advertise high theoretical speeds for premium SSDs, real-world performance often drops once the cache is filled. Conversely, HDDs offer lower, more consistent speeds. Major market players include Seagate, Western Digital, and LaCie, though product longevity varies based on design and write cycle limits.