Data from backup and cloud storage company Backblaze over the past five years shows that solid-state drives (SSDs) are more reliable than mechanical hard drives (HDDs), and SSDs have far lower failure rates than HDDs. Backblaze compared SSDs and HDDs as boot disks rather than storage disks, which are used to store logs, temporary files, SMART statistics, and more in addition to booting. Statistics show that the failure rate of SSDs was relatively stable in the first five years, but the failure rate of HDDs suddenly increased from 1.83% in the previous year to 3.55% in the fifth year, while SSDs remained at around 1%.
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