Normally, a Disk Tools floppy with Apple's HD SC Setup is used for formatting. This was part of the original operating system (System 7.1 and a system enabler).
http://support.apple.com/kb/TA47341
However, Apple HD SC Setup (the latest version avilable for download is 7.3.5) is not intended for non-Apple drives. If so, a third party formatting utility (such as Lido 7.5.6) may have to be used.
http://download.info.apple.com/Apple_Support_Area/Apple_Software_Updates/English -North_American/Macintosh/Utilities/
Apple's own Drive Setup 1.7.3 may also recognise drives that HD SC Setup cannot handle.
http://download.info.apple.com/Apple_Support_Area/Apple_Software_Updates/English -North_American/Macintosh/Utilities/Drive_Setup/
System 7.1 is not available for download. In this case you would have to use System 7.5.3 instead (no extra system enabler needed here). Unfortunately, System 7.5.3 takes up more hard disk space, and can be a bit slower than 7.1.
http://download.info.apple.com/Apple_Support_Area/Apple_Software_Updates/English -British/Macintosh/System/Full_Installs/System_7.5_Version_7.5.3/
Also, the System 7.5.3 download is not installed the normal way (see the text file). A separate startup floppy will have to be created.
The Network Access Disk 7.5 can be used (under the same link as Apple HD SC Setup 7.3.5 above). One would create the bootable disk on an older Macintosh computer via the Make A Copy button in Disk Copy 4.2 (or the Make a Floppy command under the Utilities menu in Disk Copy 6.3.3). A formatting utility has to be added manually.
http://download.info.apple.com/Apple_Support_Area/Apple_Software_Updates/English -North_American/Macintosh/Utilities/Disk_Copy/
Before we continue, please post back with answers to a few questions:
a) Is the PowerBook 180c working right now (that is, can it be used to modify disks, et cetera)?
b) If working, which system version? Does it have a PC Exchange control panel or the Apple File Exchange program?
c) The size of the hard drive?
d) What computers do you have access to? Any other old Mac with a built-in floppy drive? A Windows PC with a floppy drive?
e) Do you have StuffIt Expander for Macintosh (for example, version 4.0.1)?
Jan