Disable and remove them or at least minimize the jobs they run. This will prevent the Hard drive from running constantly. Using hdparm -S command adjust the Harddrive spin down time. Read man hdparm for more info. Following the suggestions on this page will destroy any data currently on the target device.
Some suggestions involve opening the case of the target device.
Many current handheld and other devices cannot be opened without significant risk of permanent damage to the device. Doing so will void your warrantee. These techniques have not been tried on every possible device. Undesirable results probably will occur.