Lenovo ThinkStation S20 4157 Hardware Manual page 124

Attention: Your computer supports both SAS hard disk drives and SATA hard
disk drives. However, be sure that you do not install both the SAS and SATA hard
disk drives into the same computer.
To replace a hard disk drive, do the following:
1. Remove the computer cover. See "Removing the cover" on page 96.
2. Locate the hard disk drive. See "Locations" on page 97.
3. Disconnect the signal and power cables from the hard disk drive.
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Hardware Maintenance Manual
Important
When you receive a new hard disk drive, you also receive a set of Product
Recovery discs. The set of Product Recovery discs will enable you to restore the
contents of the hard disk drive to the same state as when your computer was
originally shipped from the factory. For more information on recovering
factory-installed software, refer to "Recovering software" in your ThinkStation
User Guide.