Disk Performance: SSD write speeds extremely slow
4.5
The SSD reads fast but writing files takes much longer than expected.
Symptoms
- Slow file copy
- App install lag
- Benchmark failure
Possible Causes
- SSD nearly full
- TRIM disabled
- DRAM-less SSD cache full
Step-by-Step Fix
1
Free Up Space
Ensure at least 10-20% of the SSD is empty for wear leveling.
2
Enable TRIM
Run "fsutil behavior query DisableDeleteNotify" in CMD (should be 0).
3
Update SSD Firmware
Check the manufacturer's site for performance-fixing updates.
When to See a Technician
Cheap DRAM-less SSDs slow down significantly once their small SLC cache is exhausted during large writes.
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