Apple announced in a blog post Thursday that it’s recalling 64- and 128-gigabyte flash storage drives that were used in the previous generations of the MacBook Air sold between June 2012 and June 2013. The blog post, first spotted by Cult of Mac, says users with affected drives can either make an appointment with an Apple Genius at an Apple retail store to get the drive replaced, or go to any one of the company’s authorized service providers. Apple also warns these users not to download any new operating systems, and urges people to back up their data before having the drive replaced. Customers who have paid for repairs or replacements on their own may also be entitled to a refund. This isn’t the first recall that’s been made for a MacBook-related component or accessory. In June, Best Buy recalled MacBook Pro replacement batteries after the US Consumer Product Safety Commission received 13 reports of battery fires.