07-29-2003
Because the installation of an operating system has nothing at all to do with what, if anything, may be on the hard disk.
Your hard disk could be factory fresh with absolutely nothing on it at all and you should be able to install windows. That actually happens all the time.
If you are looking at a login screen that was painted by your unix that is sitting on your hard drive, then you simply have booted from that hard drive rather than booting from the cd.
I would guess that you attempted to boot from the cd, had some problem, and so you booted from the hard drive instead. But that is only a guess.
If you find a windows expert who can install windows, I promise you that he will not the help of a unix expert to overwrite your old unix installation.
Also, what do you think you might do if you logged on to the unix system? Do you think that you will find a unix command to overlay unix with windows?
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WREN(3) Library Functions Manual WREN(3)
NAME
wren, ata - hard disk interface
SYNOPSIS
bind #H[drive] /dev
bind #w[target[.lun]] /dev
/dev/hd0disk
/dev/hd0partition
/dev/sd0disk
/dev/sd0partition
...
DESCRIPTION
The hard disk interfaces (wren, #w, is a SCSI disk; ata, #H, is an IDE or ATA disk) serve a one-level directory giving access to the hard
disk partitions. The parameter to attach defines the numerical SCSI target and logical unit number or the IDE drive number to access.
Both default to zero.
Each partition name is prefixed by hd and the numeric drive identifier. The partition always exists and covers the entire disk. The size
of each partition as reported by stat(2) is the number of bytes in the partition, so the size of is the size of the entire disk.
The partition also always exists; it is the last block on the disk for SCSI, second to last for IDE. If it contains valid partition data,
those partitions will be visible as well. Every time the device is bound, the partitions are updated to reflect any changes in the parti-
tion file.
The format of the partition file is the string
plan9 partitions
on a line, followed by partition specifications, one per line, consisting of a name and textual strings for the block start and limit for
each partition on the disk.
The program prep(8) writes the partition table for the disk; its use is preferred to writing it by hand.
SEE ALSO
prep(8), scsi(3)
SOURCE
/sys/src/9/port/devwren.c
/sys/src/9/pc/devata.c
WREN(3)