Timothy Leyden
Analyst · Stifel
Thank you, Steve. Our strong December quarter performance benefited from solid market demand, favorable channel and business mix, and continuing good execution. The hard drive industry shipped approximately 142 million units during the December quarter, up from the September quarter and the year-ago period, and the TAM came in slightly higher than the guidance we gave on our October call. In our business, we saw strength in gaming, consistent quarter-over-quarter performance in client and enterprise, and the anticipated seasonal pickup in branded products.
Our distribution and retail channel inventory remains lean. Our revenue for the December quarter was $4 billion, including $155 million from Enterprise SSDs. While we expect our Enterprise SSD revenue growth rate to continue to exceed that of the industry, the upward trajectory in the December quarter was especially strong, given a single-source opportunity. Overall, 54% of our revenue came from non-PC applications. We shipped a total of 63.1 million hard drives at an average selling price of $60. The quarter-over-quarter increase in overall ASP was primarily driven by the seasonal uptick in branded products and strength in distribution.
Our gross margin for the quarter was 28.7%. Non-GAAP gross margin was 30.1%, excluding $40 million of amortization expense for acquired intangible assets, as well as $15 million of restructuring charges. We exceeded our implied guidance from non-GAAP gross margin by 30 basis points, primarily due to favorable business mix.
R&D and SG&A spending totaled $650 million for the December quarter. SG&A included the following items: $12 million of charges related to certain litigation; $11 million of amortization expense for acquired intangible assets; and $6 million of restructuring and other charges. R&D included $5 million of restructuring charges. As a reminder, the previous period included a flood-related insurance recovery of $65 million.
We accrued interest charges of $13 million in the December quarter relating to the Seagate arbitration matter. Tax expense for the December quarter was $37 million or 8% of pretax income. Our net income for the December quarter totaled $430 million or $1.77 per share. On a non-GAAP basis, net income was $532 million or $2.19 per share.
Turning to the balance sheet. We generated $727 million in cash from operations, and our free cash flow totaled $557 million. Our CapEx for the December quarter totaled $170 million or 4% of revenue. As part of our capital allocation program, we repurchased 2 million shares for $150 million during the December quarter. We also declared a dividend in the amount of $0.30 per share. We exited Q2 with total cash and cash equivalents of $4.7 billion, of which approximately $700 million was in the U.S.
I will now provide our guidance for the March quarter. We expect revenue to be seasonally down and in the range of $3.65 billion to $3.75 billion, reflecting the seasonally lower TAM; gross margin approximately at the midpoint of our 27% to 32% model, excluding the amortization of intangibles, reflecting the impact of lower factory utilization due to lower volumes; r&D and SG&A spending of approximately $600 million, excluding the amortization of intangibles; a tax rate of approximately 8%; and a share count of approximately 243 million.
Accordingly, we estimate non-GAAP earnings per share of between $1.80 and $1.90 for the March quarter, which includes a dilution impact of $0.10 from the sTec and Virident acquisitions. As a reminder, we expect the sTec, VeloBit and Virident acquisitions to be accretive early in calendar year 2015.
Overall we are pleased with our continued strong performance. We are enthusiastic about our prospects to play an increasingly strategic role in the evolving storage market.
Operator, we are now ready to open the call for questions.