I have read various responses to my issue (next para) to which I have some additional aspects not mentioned, to resolve. I have put in all relevant info, so, it's longer than intended.
In recent few months I repeatedly, not every day, get a message during boot saying "Windows - No Disk Exception Processing Message c0000013 Parameters 7c7.....5f8. In the solutions I have read, it is suggested that I change my drive letters (other than 'C'), especially for removable drives. I describe my current drive lettering, which has grown as I have added drives since my initial build with 4 physical drives, 2 being a pair on Raid. Changing the drive letters could be a problem.
I have my operating system and Microsoft programmes on physical disc 'C',
And 3 CD/DVD drives 'D' and 'E' and 'R' the last being an external DVD drive.
My data is on a pair of physical discs 'K' on Raid 0,
Back-ups and program downloads on a 4th physical disc in partition 'H' with a partition 'X' for around 30 other programmes.
In addition I have 2 external drives 'L' and 'F' for backup of backups, and as I use Raid 0 for my data, a continuous realtime backup.
'L' contains a partition which has a drive image of a machine I rebuilt and kept all data on it at the time, and needed as an archive. Windows sees this drive image as a Boot Drive if my Boot Order is changed to look initally at removable drives - as in when I carry out data changes that require me to boot off a drive other than 'C'.
Drive letters 'M' and 'N' are used when I use either of the 2 USB flash drives I have for making data transfers. They are only plugged in when they are being used.
So, I do not know what disc the No - Disc message relates to. Nonetheless, my machine runs perfectly. All work without error.
However, the following issue may be invloved. My Brother MFC 620CN printer for some reason causes Windows to randomly run AutoPlay checking the content of the "drive" it sees the printer as, except it can't find any content. I had thought it was a virus, but, found eventually that unplugging the USB cable for the printer instantly stopped AutoPlay after which it could be plugged back in without problem. A week or so later it happens again and so on. Last week I replaced the printer for the latest Brother printer MFC J5910DW, expecting the problem to go, but, yesterday AutoPlay was triggered again, and unplugging the new printer USB stopped it.
Having the new printer cause AutoPlay to run, I Googled the No Disc error message and read that it could indicate a pending disc failure. It was suggested I run sfc /scannow which I did, as follows:
First result was a dialogue box asking me "Files that are required for Windows to run properly must be copied to the DDL cache" and "Please insert your Service Pack 2 CD-ROM" and under that "Retry" "More Information" and "Cancel". I bought Windows XP64 as a disc from Novatech. Service Pack 2 (and 3) came as a download during a regular update. In the dialogue box, there is no option to point it to look at a location for the download, only auto seek the CD drive with a disc.
I tried to copy the downloaded Service Pack2 to a CD, both as downloaded, and as unpacked, and inserted that, but, as expected, it does not see metadata that must be in a supplied CD for Service Pack 2, and it produces a dialogue box saying "Windows File Protection . . . Please wait while Windows verifies that all protected Windows files are intact and in their original positions". I also get a third dialogue box saying "The CD you provided is the wrong CD. Please insert the Service Pack 2 CD-ROM...."
So, is the "No Disc" error message a serious problem or shall I just keep dismissing it. If serious, how do I resolve ?
Or, should I finally give up my XP64 which works so well for me and go to Windows 7 x64 when the new issue comes out.