Back up variation to External 3.5" HDD

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JeremyB2 Contributing Member • Posts: 884
Back up variation to External 3.5" HDD

I have a StarTech Dual Bay HDD/SSD Cloner/Copier which is used mainly for routine backing up to 3.5" HDDs.  There is a big difference in backup speeds between some of my HDDs

Disk 1. CrystalDisk information shown below takes a little over 2 hours to backup 810 GB:-

Disk 2 shown below takes nearly 6 1/2 hours:-

Disk 5 shown below below takes over 6 hours (I stopped it before the backup finished)

Any idea why the differences? Thank you

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