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                                                                    EXHIBIT 99.1

             KOMAG ANNOUNCES SIGNING OF RESTRUCTURED LOAN AGREEMENT

FOR IMMEDIATE RELEASE

SAN JOSE, Calif., June 1, 2000 /PRNewswire/ -- Komag, Incorporated (Nasdaq:
KMAG), a technical leader in the disk drive component industry, today announced
that the company and its senior lenders signed a definitive Loan Restructure
Agreement ("Agreement") that supersedes and replaces the four senior credit
facilities between the company and its senior lenders. Under the prior credit
facilities the company was in technical default since June 1998. By entering
into this new Agreement the company is no longer in default. Also, pursuant to
the Agreement, certain lenders elected to exchange their notes for new
subordinated convertible notes.

ABOUT KOMAG

Founded in 1983, Komag, Incorporated has produced over 450 million thin-film
disks, the primary storage medium for digital data used in computer disk drives.
The company is well positioned as the broad-based strategic supplier of choice
for the industry leading disk drive manufacturers. Through its advanced
development facilities in the United States and high volume production factories
in Southeast Asia, Komag provides high quality, leading-edge disk products at a
low overall cost to its customers. These attributes enable Komag to partner with
customers in the execution of their time-to-market design and time-to-volume
manufacturing strategies.

For more information about Komag, visit Komag's Internet home page at
http://www.komag.com or call Komag's Investor Relations 24-hour Hot Line at
888-66-KOMAG or 408-576-2901.

Contact:       KOMAG, INCORPORATED, San Jose, CA
               Ted Siegler at (408) 576-2209
               E-mail communications: ir_web@komag.com