What is the primary sign of a "bad block" in a solid-state drive (SSD)?

A primary sign of a "bad block" in a solid-state drive (SSD) is that the computer cannot read the SSD. In SSDs, bad blocks refer to sections of memory that have become unreliable or inaccessible due to wear, manufacturing defects, or other issues. When the SSD controller attempts to read from a bad block, it may result in a failure to access the data stored there, leading to the computer's inability to read the SSD entirely.

This situation is critical because if the SSD cannot read certain blocks, it may also prevent the operating system from loading successfully, creating a significant obstacle for users. While other issues like slow read and write speeds or data corruption messages can arise from various causes, they are not exclusive indicators of a bad block. The inability to read the SSD directly points to underlying integrity problems within the storage device itself, which is why this condition is symptomatic of a "bad block."