IBM X220 - Manual (Page 70)

Table 11. Removal steps of hard disk drive and solid state drive (continued)
5
HDD and HDD rubber rails:
6
6
SSD and SSD spacers:
6
6
When installing:
Rubber rails on the hard disk drive or spacers on the solid state drive must be attached to the replacement drive.
Otherwise the drive cannot be installed properly.
1040 DIMM
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“1020 Battery pack” on page 61
64 ThinkPad X220 Tablet and X220i Tablet Hardware Maintenance Manual