My hard disk is full of irreplacable things but I cannot access it. First it took a long time to appear on 'My Computer' then when I tried to open it, I got a message stating' F not accessible, I/O device error'. The drive was showing as enabled and working properly but it would not open. It also said 'parameter' not correct. I checked the web for help. I did a chkdsk F:\F run. It listed segments as unreadable. It ended with 'Deleted corrupt attribute list entry with type 128 in file 2364.' It wrote this about five times then finished with 'An unspecified error occurred'.I don't know what to do next as couldn't find anything that helps. I also did a chkdsk on the c drive from windows hoping this may help. This went through five verification stages. Under data verification it wrote 'windows replaced bad clusters in file 2499 of name winxp\system32\mf3216.dll', and replaced bad clusters in 'file 4830 of name\winxp\inf\netwv48.pnf' and in 'file 37751 of name winxp\nstaln1\14fa347.msp'.It then finished verifying everything and wrote 'volume is clean' (I tried doing a windows chkdsk for f drive where harddisk connected but cannot open it) I tried doing a scan on f drive but can't as won't access. I tried accessing it through documents,cmd/run, search but still can't access. Now it doesn't show up at all under my computer , documents etc but is listed under devices as working and enabled. I tried the windows troubleshooting but that doesn't work either.Note:the hard disk comes on and makes noise/light that connecting but doesn't show on laptop. Please help. I can't bear to think I've lost everything on the disk. I've tried what I could find out but now I'm really stuck. Thank-you.