Jarek The drives have rubber parts that cushion the heads when they're disengaged with the discs. Over time these become very sticky and will hold the head off the surface of the disc and can give faulty read/writes .... the remedy is to just remove them, the drives work perfectly without. Ours did this after about 8 years and after taking the parts off ahve worked for another 3 year with no problems. (I presume you're using them with an SSL mixing console 'cos they recommend this.) In article <34CBB4B8.3B5A(a)studiobuffo.com.pl>pl>, Jarek <bufforec(a)studiobuffo.com.pl> writes Martin Evans of Strawberry Hill & Central London - Mail me on London's history & topography, architecture, second-hand bookshops, food, pro-audio engineering, museums, collecting and wood-engraving.