July 31 (Reuters) - Memory chipmaker Western Digital Corp (WDC.O) forecast a bigger-than-expected loss in the first quarter and revenue below Wall Street targets on Monday as weak demand, mainly for its cloud business, forces it to cut production. Cloud companies will take another "couple of quarters" to clear out excess inventory, finance chief Wissam Jabre said in June. Western Digital forecast its adjusted loss per share to be in the range of $2.10 to $1.80, compared to an estimated loss of $1.40 per share. It also forecast revenue for the same period below estimates. Rival Seagate Technology (STX.O) also forecast downbeat revenue for its first quarter last week, on weakness in major market China and lower tech spending.

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Persons: Wissam Jabre, David Goeckeler, Goeckeler, Chavi Mehta, Stephen Nellis, Pooja Desai Organizations: Digital Corp, Seagate Technology, Western Digital, Samsung Electronics, SK Hynix, Thomson Locations: China, South, Bengaluru, San Francisco