Is hewlett packard a hardware manufacturer

Yes and no.
Depends on what component you had in mind..

HP is more an assembler. They take parts and assemble them. They also have components made to their specifications under their logo.

Is hewlett packard a hardware manufacturer


No. Hewlett Packard is not a hard drive manufacturer. The following list of hard drive manufacturers is current as of August 2011. This list does not include all manufacturers of SSD storage devices.



Seagate:
http://www.seagate.com/www/en-us/

Western Digital:
http://www.wdc.com/en/

Maxtor:
http://www.maxtor.com/home-en-us.html

Fujitsu:
http://www.fujitsu.com/us/services/computing/storage/hdd/

Samsung:
http://www.samsung.com/global/business/hdd/

Hitachi:
http://www.hitachigst.com/

Toshiba:
http://www.toshiba.com/

Quantum:
http://www.quantum.com/