展览12.1

KLA-Tencor Corporation

Computation of Ratio of Earnings to Fixed Charges

Fiscal year ended June 30,

(In thousands, except ratios)

2009 2008 2007 2006 2005

Earnings (losses):

Income (loss) before income taxes and minority interest

$ (602,531 ) $ 560,234 $ 677,235 $ 377,858 $ 583,076

Add back (deduct) fixed charges:

利息费用

55,339 10,767 2,781 2175年 1,750

Amortization of bond issuance costs

735 123 0 0 0

Interest portion of rental expense

4,114 3,824 3,243 2,788 3,891

Total adjusted earnings (losses)

$ (542,343 ) $ 574,948 $ 683,259 $ 382,821 $ 588717年

Fixed charges:

利息费用

$ 55,339 $ 10,767 $ 2,781 $ 2175年 $ 1,750

Amortization of bond issuance costs

735 123 0 0 0

Interest portion of rental expense

4,114 3,824 3,243 2,788 3,891

Total fixed charges

$ 60,188 $ 14,714 $ 6,024 $ 4,963 $ 5,641

Ratio of earnings to fixed charges

(a ) 39.1 113.4 77.1 104.4

(a) Earnings were inadequate to cover the fixed charges by $602.5 million in the fiscal year ended June 30, 2009.

For purposes of calculating the ratio of earnings to fixed charges, earnings is the amount resulting from adding the earnings from continuing operations before income taxes and minority interest, and fixed charges. Fixed charges for these purposes include interest expense, amortization of bond issuance costs, and one-third of rental expense, which KLA-Tencor considers to be reasonable approximation of the interest factor included in rental expense.

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