A hard disk drive (HDD), especially if it ' s older or nearly full, is the most common cause of slow startup times in laptops. HDDs are much slower than SSDs and can significantly bottleneck the boot process.
From CompTIA A+ 220-1101 Official Study Guide, Objective 4.1 – Troubleshoot common hardware problems:
“A slow startup or sluggish system performance is commonly due to a failing or fragmented hard disk drive (HDD). Replacing with an SSD can greatly improve boot times and overall system responsiveness.”
Verified Source:
CompTIA A+ Core 1 (220-1101) Official Study Guide, Chapter 4: Troubleshooting PC Hardware
CompTIA Exam Objectives 220-1101, Domain 4.1
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