Feature Description Optional memory v 256-MB DDR2-667 SDRAM SO-DIMM (PC2-5300) card 1 v 512-MB DDR2-667 SDRAM SO-DIMM (PC2-5300) card 1 v 1-GB DDR2-667 SDRAM SO-DIMM (PC2-5300) card 1 v 2-GB DDR2-533 SDRAM SO-DIMM (PC2-4200) card 1 v 2-GB DDR2-667 SDRAM SO-DIMM (PC2-5300) card 1(maximum of 4.0 GB)Note: Due to the limitation of the current 32-bit PC architecture, actual usable memory size is limited to 3 GB even though the physical installable memory size is 4 GB in ThinkPad R60, R60e, R61, and R61i computers. CMOS RAM v 242 bytes Hard disk drive v 40 GB, 5400 rpm, 9.5 mm high, Serial ATA (SATA) interface v 60 GB, 5400 rpm, 9.5 mm high, SATA interface v 80 GB, 5400 rpm, 9.5 mm high, SATA interface v 100 GB, 5400 rpm, 9.5 mm high, SATA interface v 120 GB, 5400 rpm, 9.5 mm high, SATA interface v 160 GB, 5400 rpm, 9.5 mm high, SATA interface v 160 GB, 5400 rpm, 9.5 mm high, SATA interface (FDE) v 60 GB, 7200 rpm, 9.5 mm high, SATA interface v 100 GB, 7200 rpm, 9.5 mm high, SATA interface v 160 GB, 7200 rpm, 9.5 mm high, SATA interface v 200 GB, 7200 rpm, 9.5 mm high, SATA interface (FDE)Supported hard disk drives depend on the model. Ultrabay Enhanced device (some models) v CD drive, 12.7 mm high v DVD drive, 12.7 mm high v DVD/CD-RW combo drive, 12.7 mm high v DVD-RAM/RW drive, 12.7 mm high Fingerprint reader Some models I/O port v External monitor connector v Stereo headphone jack v Monaural microphone jack v Docking connector (for some models) v RJ11 connector v RJ45 connector v Universal serial bus (USB) connector 3 (compatible with USB 1.1 and 2.0) v IEEE 1394 connector (for some models) v Video-out connector (for some models) Internal modem v 56.6 Kbps Audio v Built-in stereo speakers v Built-in mono speakers v Software control volume Ethernet (on the system board) v Gigabit Ethernet (continued) Product overview 36 MT ThinkPadfi ThinkPad R60, R60e, R61, and R61i