I have a 64K Apple II Plus and 2 Apple Disk II Drives. The first drive came with the computer from the previous owner. He reported that before he shipped it, that it was working perfectly and he had pictures to demonstrate this. However, upon the Apple II's arrival in Ireland from the UK, it no longer seems to be able to read any of the 20+ disks that it came with. When trying to boot from any disk it makes a series of rapid clicking sounds for about 20 seconds before giving up and going idle. When I use any drive utility software (booting from SD card adapter), it gives me a "RWTS READ ERROR (40)" when I try to initialise a scratch disk or calibrate speed or anything. I opened it up and fiddled about to see if I could find any obvious flaws. One thing I thought was strange was a white circular turntable below the the disk and under the lens. It seemed to have a little needle on it like an record player but it kept skipping off. This was the cause of the constant revving sound the drive gives when I insert a disk. It just keeps clicking really quickly instead of going to the usual "zzzt zzzt click zzzt" that should accompany these drives. I recorded a video of the drive in operation while partly disassembled to show what is happening when it is reading. Thinking the drive was faulty and that I was in over my head, I purchased a second DISK II drive, this time from the USA. Same story again. Same errors, same problems. I would think that perhaps the interface card is to blame, or possibly the system itself, but... It works perfectly when I bootstrap ProDOS 8 with ADTPro via audio cables and also boots perfectly from an awesome Bulgarian SD card drive that plugs straight into the Disk II interface card like a real disk II. I am really annoyed that neither of my drives work at all. I have taken them apart, and cleaned them both thoroughly inside and out, including the "lens" on each. A video of my problem can be seen here. Any help at all would be GREATLY appreciated, thank you!