All 7200rpm PATA drives have been long discontinued. Samsung's 5400 160GB PATA drive works nearly as fast in direct actual comparison tests. Formatting above 120GB on 1100 requires partitioning. I got 40/40/69 (total usable space) using Acronis True Image easily. Others have struggled to get similar outcomes. There's ridiculously long thread on the topic in 1100 forum history.
100% Old School tablet setup:
Sahara i440D - 4GB/500GB/7200 - Vista screams!
HP TC1100 1.2 - 2GB/160GB/5400 - Vista - portrait - primary computer.
HP TC1100 1.2 - 2GB/160GB/5400 - Vista - primary work computer.
HP TC1100 1.0 - 2GB/60GB/7200 - XP - laptop - partner's primary computer.
Acer 303xmi 1.6 - 2GB/100GB/7200 - Vista - laptop - work computer.
Motion M1300 1.0 - 2GB/60GB/7200 - Vista - semi-retired (needs repair).
Motion M1300 - for parts.
Motion M1400VA - awaiting resurrection.