<s>
At	O
least	O
223	O
companies	O
have	O
manufactured	O
hard	B-Device
disk	I-Device
drives	I-Device
.	O
</s>
<s>
Xebec	O
–	O
Xebec	O
's	O
1410	O
SCSI	O
controller	O
formed	O
the	O
basis	O
of	O
IBM	B-Device
PC	O
's	O
hard	B-Device
disk	I-Device
controller	O
.	O
</s>
