IBM THINKPAD S05L-1270-01 - Manual (Page 366)

Check the Model
There are two models of 760E: Both come with an
FDD built-in, but only one model is upgradable with an
internal CD-ROM drive.
The nonupgradable 760E model has the FDD
built-in space that is thick enough to install only
an FDD.
The upgradable 760E model has the FDD built-in
space that is thick enough to install a CD-ROM.
Verify the 760E model you are servicing before
ordering FRU parts. FRUs for the CD-ROM
upgradable model are listed in the 760E (CD
Upgradable Type) 760ED parts list. (See “Model
760E (CD Upgradable Type) or 760ED” on
page 357.)
354 IBM Mobile Systems HMM