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Writing CD-R's is a real-time process which must run constantly without any interruption. A slowdown or interruption of the data-stream between the harddisk or CD-ROM and the CD-Writer, will result in a coaster (buffer underrun error). Below are a few precautions u can take to strenghten the stability of the data flow which will help to avoid coasters

When using Win95 or Win98 change the workstation Typical Role from: Desktop computer to Network server This can be done as follows:

 [START] -> Settings -> Control Panel -> System -> Performance -> File System -> Typical role of this computer. This will increase the system file-system cache settings from 32/677 paths/files to 64/2729 paths/files. This will be very helpful for burning On-The-Fly.

Disable the Auto insert notification for the CD-Writer & CD-ROMs). 
This can be done as follows:  [START] -> Settings -> Control Panel -> System -> Device Manager -> CDROM -> Device Name -> Settings When having problems burning On-The-Fly, just use CD-Writer software, like Nero or CDRWIN, to first create a CD Image on harddrive and then to write the CD-R from the image. Use a separate disk partition/harddisk to burn from as this partition can be formatted to avoid running low on space and large partition fragmentation. If there is only one partition then regularly defragment the harddrive, containing the files which are to be burned.  NOTE:Auto insert notification must be Enabled on the CD-Writer for Direct CD to work correctly.

SCSI Burn Tips
Here are some very important tips how to configure the system when using a SCSI CD-Writer: Enable the SCSI Disconnect for the SCSI CD-Writer. This is usually done in the SCSI Card Setup and here: [START] -> Settings -> Control Panel -> System -> Device Manager -> CDROM -> Device Name -> Settings index

IDE/Atapi Burn Tips
Here are some very important tips how to configure the system when using a IDE/Atapi CD-Writer: Disable the IDE Busmastering Drivers for the IDE/Atapi CD-Writer. This is usually done here: [START] -> Settings -> Control Panel -> System -> Device Manager -> CDROM -> Device Name -> Settings Disable the Ultra DMA Setting and, if possible, lower the IDE PIO to Mode 3 or Mode 4 for the IDE port to which the IDE CD-Writer is connected. This is usually done in the PC Setup and/or here: [START] -> Settings -> Control Panel -> System -> Device Manager -> CDROM -> Device Name -> Settings When using Windows 95/98 then ASPI drivers are needed so the CD-R software is able to access the IDE/Atapi CD-Writer