<s>
Apple	B-Operating_System
HD	I-Operating_System
SC	I-Operating_System
Setup	I-Operating_System
is	O
a	O
small	O
software	B-Application
utility	I-Application
that	O
was	O
bundled	O
with	O
various	O
versions	O
of	O
the	O
classic	B-Application
Mac	I-Application
OS	I-Application
and	O
A/UX	B-Operating_System
operating	O
systems	O
made	O
by	O
Apple	O
Computer	O
.	O
</s>
<s>
Introduced	O
with	O
Apple	O
's	O
first	O
SCSI	B-Architecture
hard	B-Device
drive	I-Device
,	O
the	O
Hard	B-Device
Disk	I-Device
20SC	I-Device
in	O
September	O
1986	O
,	O
Apple	B-Operating_System
HD	I-Operating_System
SC	I-Operating_System
Setup	I-Operating_System
can	O
update	O
drivers	O
and	O
partition	O
and	O
initialize	O
hard	B-Device
disks	I-Device
.	O
</s>
<s>
It	O
was	O
often	O
used	O
when	O
reinstalling	O
the	O
operating	O
system	O
of	O
an	O
Apple	B-Device
Macintosh	I-Device
computer	I-Device
,	O
or	O
to	O
repair	O
corrupt	O
partition	O
information	O
on	O
a	O
SCSI	B-Architecture
hard	B-Device
disk	I-Device
.	O
</s>
<s>
Prior	O
to	O
its	O
introduction	O
,	O
the	O
formatting	O
of	O
disks	O
was	O
handled	O
exclusively	O
by	O
the	O
Mac	B-Device
's	O
Finder	B-Application
application	O
,	O
or	O
by	O
third-party	O
formatting	O
utility	B-Application
software	I-Application
customized	O
for	O
a	O
specific	O
disk	O
drive	O
.	O
</s>
<s>
The	O
version	O
of	O
Apple	B-Operating_System
HD	I-Operating_System
SC	I-Operating_System
Setup	I-Operating_System
that	O
shipped	O
with	O
the	O
classic	B-Application
Mac	I-Application
OS	I-Application
was	O
only	O
able	O
to	O
manipulate	O
hard	B-Device
disks	I-Device
that	O
featured	O
Apple	O
ROMs	O
.	O
</s>
<s>
Versions	O
of	O
the	O
program	O
that	O
were	O
bundled	O
with	O
A/UX	B-Operating_System
,	O
however	O
,	O
could	O
be	O
used	O
with	O
any	O
SCSI	B-Architecture
disk	O
.	O
</s>
<s>
A	O
third-party	O
patch	O
was	O
released	O
enabling	O
standard	O
editions	O
of	O
Apple	B-Operating_System
HD	I-Operating_System
SC	I-Operating_System
Setup	I-Operating_System
to	O
work	O
on	O
any	O
SCSI	B-Architecture
disk	O
.	O
</s>
<s>
In	O
the	O
mid-1990s	O
,	O
when	O
Apple	O
began	O
shipping	O
computers	O
using	O
ATA	B-Protocol
hard	B-Device
drives	I-Device
,	O
Apple	B-Operating_System
HD	I-Operating_System
SC	I-Operating_System
Setup	I-Operating_System
was	O
joined	O
by	O
Internal	O
HD	O
Format	O
,	O
which	O
could	O
only	O
format	O
IDE	B-Protocol
drives	I-Protocol
.	O
</s>
<s>
Eventually	O
,	O
both	O
Internal	O
HD	O
Format	O
and	O
Apple	B-Operating_System
HD	I-Operating_System
SC	I-Operating_System
Setup	I-Operating_System
were	O
superseded	O
with	O
Drive	O
Setup	O
in	O
1995	O
,	O
which	O
combined	O
SCSI	B-Architecture
and	O
IDE	O
formatting	O
abilities	O
,	O
and	O
ultimately	O
by	O
Disk	B-Application
Utility	I-Application
in	O
macOS	B-Application
.	O
</s>
