Apple today announced a replacement program for the 3TB hard drive included in some 27-inch iMac models due to a concern that some of the components “may fail under certain conditions.” Apple doesn’t mention a specific product number, but notes that affected machines would have been sold between December 2012 and September 2013, which would apply to Apple’s late 2012 iMac model.

Apple notes that it is contacting iMac owners that may be affected, but users can also manually submit a claim through the company’s webpage announcing the replacement program.

Apple said it “recommends replacing affected hard drives as soon as possible” and customers can take advantage of the program through Apple retail stores, authorized service providers, or tech support channels.

Apple adds that “the program covers affected iMac models until December 19, 2015 or three years from its original date of sale, whichever provides longer coverage for you.”