FD400 drive troubleshooting

It is your list, but... Firstly, this came about by topic-drift from the use of stroboscope disks. And IM<HO those are on-topic because of their use in setting the speed of classic computer peripherals (disk drives, teleprinters, etc). I believe reparir methods for classic computer stuff are on-topic. Seocndly, what abotu flexidisks of computer software? Did any of the US magazines ever have those. The 'flexidisk' was a thin, flexible gramophone/phonegraph record. Some UK magazines (and I belive Elektor) either included them or had them avaialbe for a nominal charge. Said records, rather than containing musix, contained the same sort of audio tracks as you'd get when you saved a program to cassette on a particular home computer [1] . You linked the audio input of your home micro to your record player, played the disk amd thus loaded the program. Mind you, I don;t think the turntable speed was all that critical :-) [1] Were there ever Basicocde flexidisks? For those who've not come across this idea, started IIRC in the Netherlands, it was a sort of universla tape/BASIC system for popular home micros of the time. There were 2 parts to it 1) A common cassette recording format -- ASCII coded, not tokenised, CUTS tones, etc. 2) A set of machine-secific subroutes using line numbers <1000 to handle machine-specific thingsl ike claring the screen, postiioning the cursor, detecting a keypress, and so on. Your program started at line 1000 and GOSUBed to these subroutines to perform the particular function. The idea was that 'ypour program' could be loaded on any machine (given the right set of subroutines) and run there. There were certainly Basicode translator systems for the PETs, C64, TRS-80 M1/3, Apple ][, BBC micro, etc. Broadcase radio stations both in the Netherlands and the UK transmitted Basicode programms in the middle of the night. I rememebr staying up to record them on audoo cassette, adn then loading them into my TRS-80, etc. -tpny