Motorola disclosed Friday, in a filing with the Securities and Exchange Commission, that it is taking a fourth-quarter pre-tax charge of about $90 million for severance costs for 1,600 employees whose jobs were cut. The 3rd largest mobile phone manufacturer announced in May plans to cut 7,500 jobs and reduce annualized costs by $1 billion through the end of 2007 and 2008. In the first nine months of 2007, Motorola took charges of $311 million related to severance costs for about 5,100 employees. In October, Motorola reported a 94% drop in third-quarter profit after a loss earlier in the year.