If a bufferunderrun occurs, then the CD Writer has not received the data quickly enough. One or several of the following 4 points is the cause in this case:
The source is too slow, e.g. if data is being transferred from a network, a floppy or from exchangeable data carriers.
The connection between source and the system is
too slow, i.e. if the source drive is connected to the parallel port and this is only being run in SPP mode or
is blocked at times by the connection being used by another device so that a constant flow of data is not possible.
The PC is too busy to process the incoming data, e.g. by using an active virus scanner in the background.
The connection between the system and the CD Writer is too slow or blocked at times (see 2.).
Initially it is advisable to download the newest Nero version from the ahead-WebSite as in the process of development the susceptibility of Nero with regards to buffer underruns is decreasing.
If you own a device by Iomega: Unfortunately its driver IOMEGA.VXD (in the Windows\System\IOSUBSYS directory) interferes with the data transfer. If you are only using a ZIP drive, then this driver can be removed or deactivated. See Deactivating drivers.
In Windows 98 and Windows 98SE drivers are loaded which as a generla rule are never needed but can cause problems. this drivers can all be found in the Windows\System\IOSUBSYS directory. See also: Deactivating drivers.
Is only needed if you are using an IDE CD changer.
Is only needed if you are using a very old NEC CD-ROM
Is only needed if you are using a Torisan 3x CD changer.
If a time of more that 100 minutes is given in the log file and if you are using a Sony 928 CD Writer (or compatible)
then switch off the automatic message when changing.
If the buffer Underrun occurs relatively near the beginning of the burning process, then for test purposes the switch off the automatic for the CD drives should be deactivated.
If you are using a mainboard with an Intel chip set, Windows 95 (until OSR2) and the busmaster driver is being used, then please update the busmaster driver to at least version 3.02, as this is the earliest version to correctly support CD-Rs and CD-RWs.
http://developer.intel.com/design/chipsets/drivers/busmastr/index.htm (Intel Chipsets: Busmaster IDE drivers for Windows 95)
If you use one of the following types of CD Writer :
Grundig CDR100IPW, HP 4020, Kodak CDR240, Mitsubishi CDVR2X4, Mitsumi CD-R CR-2401TS, Philips CDD2000, Plasmon CDR4220, Plasmon RF4100, Plasmon RF4102, Wearnes CDR-432
and you are using an Adaptec 1542CF, then you should use the Utility SCSISelect in Device Configuration for the ID of your CD burner to change the value from FAST SCSI to NO.
If you have installed Office 97 or newer, then this journal function should be deactivated. This journal function protocols every time files are opened and closed by an Office program. See: Deactivating the Journal function of Office.
A bufferunderrun can also occur if the driver NECATAPI.VXD is loaded.
The driver can be found in the Windows\System\IOSUBSYS directory. Please change the file extension from .VXD to .VX_ and restart Windows.
A buffer underrun can also occur if the bus has too higher pulse (instead of 66MHz, 75MHz etc.)
For SCSI CD burners in the BIOS of your SCSI controller, the option ‘maximum synchronous transfer’ should be set to 10 as for numerous SCSI controllers the space of time between two ‘bus retries’ is too long.
If you are using an Adaptec UW / U2W SCSI hostadapter, then you should download the newest drivers for your SCSI hostadapter: ftp://ftp.adaptec.com/pub/BBS/win95/7800w9x.exe
If the buffer underrun only occurs during the burning process but never during the simulation and if an NCR controller is being used and the Internet Explorer 5.0 beta is installed.
Please deinstall the internet Explorer 5.0 beta.
Please check if the Easy CD driver CDR4VSD.VXD is still there. Please remove it. On this, see drivers of other CD burner programs. Unfortunately this driver seems to cause more problems with newer Nero versions than it did with older versions.
If you are using an IDE burner and have got a harddisk connected to the same port, then please connect the burner separately to another port for test purposes (as the master), as some chip sets or their drivers cause problems if the burner and the harddisk are connected to the same port.
Example: TX Pro Chip set
If the buffer underrun stopped in the case of a direct copy straight after starting the burning process or the simulation stops, then it can be assumed that the CD-ROM drive stopped turning while writing the Lead-In.
On this, see Wake up the CD-ROM drive.
Please in Start->Settings->Control Panel->Device Manager for all devices Sync data transfer deactivate and disconnect .
If a buffer underrun occurs because you are reading in data from a JAZ drive, then you should deactivate the Spindown of the drive. Plesae read the following article on this:
Nero reads the data from CD Writer or CD-ROM drive at most with 4x instead of e.g. 20x/32x in the case of the Plextor CD-ROM drive.
If you are using Windows 95, then you should download the following update and install it:
If the Internet Explorer 4.0 (or higher) is installed, then please deactivate Active Desktop. If this doesn’t help, then please deinstall the Internet Explorer and have another go at burning.
If you are working in Windows NT, then in
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management
at the DWORD entry
there should be a 0 as otherwise caching gets a higher priority than executing the programs.
A buffer underrun may also occur because in Windows the cache grows rapidly while burning. This is still not prevented by the up-to-date Nero version. Here you are recommended to download the program Cacheman in which the settings of the Windows Cache can be optimized for burning CDs.
If you operate the CD Writer at the parallel port
please change the protocol setting in the BIOS from SPP to EPP or ECP. Please note however that not every CD Writer supports both protocols but only one of the two.
Please close all printer monitor programs. Some printers even have to be disconnected so that no problems occur.
If EZ-SCSI is installed, the deinstall this software for test purposes as this software can also cause a lot of traffic through the SCSI/IDE bus.
Please also read through the Recommended hardware settings and check the Recommended software settings .
Please close all programs active in the background: Antivirus programs; programs which link into the file system, e.g.: ZipMagic; Scheduler; monitor programs for printers, network, fax, e-Mail;
If you computer is connected to a network, then you should disconnect all access to your printer for the duration of the burning process.
If you are using a Ricoh MP6200, then please update to firmware 2.40.
Please set the following entry in the registration to 1 or 0 and Nero restart:
HKEY_CURRENT_USER\Software\ahead\Nero - Burning Rom\Recorder\SCSICmdQueuing
If you are using an infra-red device, then please read the following article:
http://support.microsoft.com/support/kb/articles/q184/2/04.asp (How to Troubleshoot Issues with Infrared Devices)
If your are working in Windows 95, then please read the following article:
http://support.microsoft.com/support/kb/articles/q141/3/68.asp (Poor Performance from CD-ROM-Based Program)
If you newly create a Media Vision Fusion 16 soundcard and a CD-ROM drive is connected to this device, please read the following article:
http://support.microsoft.com/support/kb/articles/q136/5/55.asp (Delay Occurs Accessing Phillips CD-ROM Drive)
If you are using a 1x CD-ROM drive and are working in Windows 95, then please read the following article:
http://support.microsoft.com/support/kb/articles/q134/7/09.asp (Slow Performance with Single-Speed CD-ROM Drive)
If you have updated from Windows 95 to Windows 98, then you should read the following article:
http://support.microsoft.com/support/kb/articles/q189/0/92.asp (Problems with Hard Disk and CD-ROM Drive After Upgrading)
http://support.microsoft.com/support/kb/articles/q189/5/18.asp (Problems with Hard Disk Controller After Upgrading to Windows 98)
If you are using Windows 95, then you should download the following file, as the original IOS.VXD file can cause problems (extremely slow reading in)
Information on this:
http://support.microsoft.com/support/kb/articles/q149/5/64.asp (Poor Performance Reading Video CD in IDE CD-ROM Drive)