H E L P ! ! ! From Jon Ripley (D5B) I suppose you could also call this a history of error detection! I have a A3010 with a HD 3.5" drive and a BBC Master with a DD 3.5" drive (the Sony on that comes with the compact). If I format an ADFS L disc on the Arc, if I verify it on the Master, either various sectors on side 2 of the disc seem corrupted (usually verifies but with several retries) or entire tracks cannot be found, or even both. If I then verify the disc again, the errors may vanish and other errors will be detected on other sectors and/or tracks, sometimes the disc will verify with no errors. If I verify the disc on the Arc no errors are detected and the files can be loaded with no problems. By errors I mean tracks or sectors not found or retries needed when loading sectors (Data CRC errors). If I format an ADFS L disc on the Master, it verifies with no errors and the Arc verifies it with no errors. I can save files to the disc on the Arc and the disc will still verify with no errors on the Arc. When I use the disc on the Master, any files saved on the first side of the disc will load with load with no errors but any files saved on the second side of the disc will have errors. Again these errors are different for each time the disc is used. These errors do not change if I use a different disc drive on the Master, I have not tried a different disc drive on the Arc as I do not have one but I have had no problems with ADFS D, ADFS E, ADFS F and DOS 1.44 formatted discs although I have only used these discs on my computer, I have exchanged ADFS E and ADFS F discs with other people in the past and no problems have been detected. I formatted a disc twice in a row on the Master and save some files on the second side of the disc, the errors occurred. I also formatted a disc twice in a row on the Arc, the disc verified with errors on the Master and these errors were still present after I saved files on the disc. The Step setting on the Arc was set to 3 ms (the actual step time is 4 ms on the Arc), the equivalent FDrive setting on the Master was set to 6 ms. I reset the Master to a step time of 3ms (but it may have been 30 ms as I am unsure which drive controller I have in the Master). At first this seemed to help and a disc verified with no errors, another disc, a backup (done on the Arc) of an error free ADFS L disc written on the Master, showed many errors and missing tracks. When a backup of the same disc was made on the Master, no errors were detected - (in this instance the Arc had nothing to do with the disc). I changed the Master and Arc to a step time of 6 ms, again this seemed to help but the same disc would verify with anything from 0 retries to 30 tracks not found and 12 retries. (I only verified the disc a few times but each time the number and nature of the errors changed.) As the new step rate was affecting the performance of the Arc I reset it to 3 ms. I retried the Backup experiment and there was no difference. I formatted an ADFS E disc on the Arc, there were no verify errors on the Arc, I than verified it on the Master, there were no errors on side 0 but on side 2 there were - as usual - random Data CRC errors and occasional tracks or sectors not found. I wrote some data to the disc on the Arc, it verified error free again on the Arc, I then verified it on the Master, again on side 2 of the disc the errors persisted. I formatted an ADFS L disc on the Arc and listened carefully to the drive (the clunk, clunk sounds that all drives make), after side 0 was formatted the clunks slowed down when side 2 was being formatted. I formatted a 720k DOS disc on the Arc but I could not determine whether the drive slowed down when it was formatting side 2 of the disc. I verified this disc on the Master, there were no errors on side 0 but there were random data CRC errors on side 2, although in the six times I verified the disc there were considerably less errors than I had detected before on other disc formats. I formatted an 80 track DFS disc on the Master, it verified okay on the Master. I saved some files to the disc in the arc and verified that disc on the Master, no disc errors were detected. On the Master I saved a new file over the one that the Arc had saved, when I verified the disc again, no errors occurred. I formatted an 80 track DFS disc on the Arc, it verified okay on the master, I saved some files to the disc on the Arc and the disc verified with no errors on both computers. But when I saved some files on side 2 of the disc on the Master and verified the disc again, random errors occurred. (The DFS filer I used was Richard Averill's ArcDFS filer version 1.00.) I have yet to verify a disc formatted on the Arc on my computer on the computer of a friend who lives locally, although I have had no problems swapping discs in the past I am unsure what the result will be but I think that the disc will verify with the same random errors. I really am at the end of my tether, I desperately need to solve this problem, I am assuming that the problem probably is with the drive on the A3010 but it may be a problem with the drive controller instead. I do not believe that the problem lies with the Master or the 2 disc drives that I have used on the Master. Please, please, if you can, help me! One of the reasons is that I have a lot of files on the Arc that I need to transfer to the Master, these include, my hard drive backup, my 8BS submissions and several PD discs that I am currently working on for Chris. Also if you have a spare, fully working drive for the A3010 (one for the A3020 one would be fine - I assume) and it is for sale then please get in touch. My address and phone number are: Jon Ripley, BBC User Group, 15 Wexford Court, 14 Biddenden Close, Eastbourne, East Sussex BN23 7HX. Telephone: (01323) 768421 (anytime) From: K6X (Cluke) Subject: Help Wanted Is there a User Group for Amstrad computers? A friend of mine has been given one, and needs help with it. Ta ever so.