No, it's one command.

DOS:

>cd
E:\

>cd c:
C:\Work

>cd c:new

>cd
E:\

>cd c:
C:\Work\New
[download]

Perl equivalent:

print(getdcwd(), "\n");       # cd    -> E:\
print(getdcwd('c:'), "\n");   # cd c: -> C:\Work

{                             # cd c:new
   my $drive = substr(getcwd(), 0, 2);
   chdir('c:new');
   chdir($drive);
}

print(getdcwd(), "\n");       # cd    -> E:\
print(getdcwd('c:'), "\n");   # cd c: -> C:\Work\New
[download]

cd will not change the current drive.
chdir will.
I'm showing how to change the working dir on a drive without changing to that drive, like cd does.