install crashes trying to prepare to install 7.0
laid out disks, filled out descriptions of all the
partitions, selected packages, then instead of loading
7 it crashed.

disk layout was
hda1 /dos/c
hda2 swap
...
hdd4 /

Here is the contents of anacdump.txt generated by the crash:

Traceback (innermost last):
  File "/var/tmp/anaconda-7.0.1//usr/lib/anaconda/iw/progress_gui.py", line
20, in run
    rc = self.todo.doInstall ()
  File "/var/tmp/anaconda-7.0.1//usr/lib/anaconda/todo.py", line 1480, in
doInstall
    if self.method.systemMounted (self.fstab, self.instPath,
self.hdList.selected()):
  File "/var/tmp/anaconda-7.0.1//usr/lib/anaconda/image.py", line 46, in
systemMounted
    self.loopbackFile = mntPoint + fstab.filesystemSpace(mntPoint)[0][0] +
\
  File "/var/tmp/anaconda-7.0.1//usr/lib/anaconda/fstab.py", line 258, in
filesystemSpace
    space.append((mntpoint, isys.fsSpaceAvailable(topMount + '/' +
mntpoint)))
  File "/usr/lib/anaconda/isys.py", line 16, in fsSpaceAvailable
    return _isys.devSpaceFree(fsystem)
SystemError: (2, 'No such file or directory')

Local variables in innermost frame:
fsystem: /mnt/sysimage//dos/c

ToDo object:
(itodo
ToDo(dp2
S'method'
p3
(iimage
CdromInstallMethod
p4
(dp5
S'progressWindow'
p6

<failed>

p1