Explanation
A buffer underrun error means that, for some reason, the flow of
data from hard disk or CD-ROM to CD-Writer was interrupted
long enough for the CD-Writer's buffer to be emptied, and
writing was halted. The "buffer" can be described as a
reservoir area in the Writer that ensures a constant feed of
information is available to the laser. If this buffer is
depleted during an actual write operation rather than a
test, the recordable disc may be ruined. Since CD-Writers
depend on the overall health of the computers to which they
are connected, any process that interferes with the steady
stream of data will increase the chance of a writing
failure.
Possible sources and causes of buffer underruns
* Hard disk
* File fragmentation.
* Not enough space in the temporary directory.
* Hard disk compression. HP does not recommend
writing from a compressed hard disk or disk
partition.
* Hardware
* Slow source devices
* Incorrect hard disk controller settings
* Direct Memory Access for the hard disk must be
enabled
* Overall system configuration
* Computer unable to allow fast enough data
transfer
* Old device drivers
* Memory-resident programs
* Any program that may activate on its own
* Antivirus software
* Screensavers
* System agents
* Schedulers
* TSR (terminate and stay resident) software
* Networks
* System sounds
* Animated icons
* Networks
* Recording across the network (usually too slow to
maintain adequate throughput speed)
* Incoming e-mail or faxes
* Other people accessing the computer
* Files to be recorded
* Recording many small files
* Damaged source files (data loss)
* Trying to record files in use by the system or
other applications
* Other
* Copying from a scratched, dirty, or damaged CD
* Inherent issue with the blank media (such as a
manufacturer defect)
Checks and prevention
* Log out of any networks, if possible, including
Windows for Workgroups and/or Microsoft (R) Network.
* Copying audio on the fly requires a source CD-ROM
drive that supports digital audio extraction.
* In any operating system, always use the newest drivers
from the SCSI or IDE controller card manufacturer.
* Do not try to copy empty directories, zero byte files,
or files that may be in use by the system at the time.
* More than 10,000 very small files should be written to
an .ISO image first or recorded at 1x, if possible.
* The temporary directory should always have space free
that is at least twice the size of the largest file
being recorded.
* Try a different recordable disc.
* Ensure that the drive is plugged into a reliable power
source, without other high power devices plugged into
the same outlet.
Other information about buffer underruns
If buffer underruns keep occurring when trying to write to the
CD-R, select Test before writing in the software. This will
perform a simulated write of the exact file set chosen.
Since this process is not actually writing on the disc, it
will not ruin the CD if there is a failure.
Zip, slower CD-ROMs, and network drives do not have a high
enough sustained transfer rate and/or access rate to keep
the CD-Writer's buffer full during a writing session. When
writing from these types of devices, select the Write To
Hard Drive First option in the HP CD-Writer software and
free enough hard drive space for the amount of data being
recorded to the CD.
Use the "Write To Hard Drive First" option in the HP CD-
Writer software to lessen the number of accesses to be done
to the hard drive and remove the strain of writing the ISO
image on the fly during a writing session. Even if the ISO
image is being written to the same drive that is the source
for the files in question, this will improve the chances of
a successful write.
Disable any background applications running in Windows
(screensavers, virus checkers, print managers, video
managers, and system monitors). Disable any network
connections or sharing that may interrupt the hard drive
during a writing session.
Troubleshooting steps
Below are troubleshooting steps that will help create an optimal
computer environment for CD writing. Choose the appropriate
section for the operating system.
Windows 95, Windows 98 and Windows Me
1. Removing the autoexec.bat and config.sys files:
The config.sys and autoexec.bat files are legacy
configuration files from the DOS (R) operating
system. These files are not necessary to run
Windows 95, 98 or Me, although for backward
compatibility, some devices and software
applications may still load commands in these
files. By renaming these files and restarting the
computer, one can determine if the commands listed
in the files are causing the problems with
writing. The simplest way to do this is to select
Start, Find and look in the Windows directory for
autoexec.bat. Right-click the autoexec.bat file
and select Rename. Give the file a three-digit
extension such as .old or use your initials (for
example; .jfk). Follow the same procedure to
rename the config.sys file. It is just as easy to
reinstate these files to their original state. The
reason for remembering the extension is that you
may want to name these files back to their
original form if the problem is not resolved or if
there is a need to use a command resident in one
of the files.
2. Slowing down the write speed.
This suggestion is made as a workaround to achieve
a successfully written disc and to test the
hardware functionality of the CD-Writer. HP's
intent is not to ask customers to settle for
something less than they expect in terms of
writing speed, but rather to establish the ability
of the CD-Writer to perform at any level and to
proceed toward optimizing the writing speed. This
will give the system a few seconds longer to get
the data from the source drive to the CD-Writer.
There may be problems copying certain files and
slowing the record speed will help with these
files. You have the ability to choose a writing
speed when the dialog "Create a CD" appears. If
successful when using a slower writing speed, then
more investigation into possible causes for data
slowdowns or interruptions is necessary to achieve
faster writing speeds.
3. Disabling "Write on the fly" in Easy CD Creator.
This section only applies to Easy CD Creator
version 3.x.
Disabling the "Write on the fly" is especially
true when attempting to transfer data from a CD-
ROM drive. Some CD-ROM Drives are not fast enough
to succeed as a source device. By adjusting the
On-the-fly setting to Never, the software will
generate a temporary representation of the
information to the hard drive as a temporary file
and proceed to record it to CD directly from the
hard drive. The hard drive provides much faster
throughput than any CD-ROM drive. If the write
process succeeds with this approach, then the
problem is probably related to the original source
CD-ROM drive. Disable "Write on the fly" by
canceling the Wizard and clicking Tools, then
Options. Click the Advanced tab and set Write on
the fly to Never.
4. Run Scandisk. (95 and 98 only).
Errors in files can cause a slow down in data
transfer. To repair these files, run a Scandisk at
least once a week. To run the Scandisk utility,
click Start, Programs, Accessories, System Tools,
then Scandisk. It will ask which drive or drives
you wish to Scandisk. Run Scandisk on all hard
drive letters for the system.
5. Run Defrag, full optimization (95 and 98 only).
When files are scattered across the hard drive, it
becomes difficult for the hard drive to access
them as quickly as when they are organized in
contiguous blocks. To prevent files from being
fragmented on the hard drive, defragment hard
drives at least once a week. Click Start,
Programs, Accessories, System Tools, then Defrag.
It will ask which drive or drives you wish to
Defrag. Run Defrag on all hard drive letters for
the system.
6. Run a virus check.
There are known viruses that can cause a computer
to run in 16 bit mode which could generate a
buffer underrun. Update virus software to the
latest version.
7. Close all background running programs and TSRs
(terminate and stay resident).
Programs running in the background use up system
resources and can cause interruptions in the
writing process. Closing all open applications may
help prevent buffer underruns. To check which
applications are currently running, hold down the
CTRL and ALT keys, and press the DEL key once.
This will open the Close Program dialog box in
Windows 95, 98, and Me.
The only program on this list necessary for
Windows to work is Explorer. By highlighting the
other items on this list one at a time and
selecting End Task in the lower corner, the
highlighted application will be taken out of
memory. After pressing End Task, the Close Program
dialog box will close. To again open the Close
Program dialog box, press the CTRL - ALT - DEL key
combination again. This operation of opening the
Close Program dialog box and ending task on items
should be repeated until only Explorer is left
running in the background.
8. Turn off power management in the computer's BIOS
and in Control Panel.
If Power Management is enabled for the computer,
the hard drive may spin down and the processor
will clock down, causing the CD-Writer to generate
a buffer underrun. To turn off Power Management in
the Control Panel go to Start, Settings, Control
Panel, and Power Management or Power Options.
Consult the computer manufacturer user manual to
learn how to enter the BIOS, or CMOS, or System
Setups to disable power management.
9. Disable any screen savers in use.
To de-activate the screen saver, go to Start,
Settings, Control Panel and double-click the
Display Icon. Choose the Screen Saver tab when the
Display dialog box appears and set the screen
saver option to None.
Windows NT and Windows 2000 Professional
1. Disable "write on the fly" in Easy CD Creator.
This section only applies to Easy CD Creator
version 3.x.
Disabling the "Write on the fly" is especially
true when attempting to transfer data from a CD-
ROM drive. Some CD-ROM Drives are not fast enough
to succeed as a source device. By adjusting the
On-the-fly setting to Never, the software will
generate a temporary representation of the
information to the hard drive as a temporary file
and proceed to record it to CD directly from the
hard drive. The hard drive provides much faster
throughput than any CD-ROM drive. If the write
process succeeds with this approach, then the
problem is probably related to the original source
CD-ROM drive. Disable "Write on the fly" by
canceling the Wizard and clicking Tools, then
Options. Click the Advanced tab and set "Write on
the fly" to Never.
2. Run a virus check.
There are known viruses that can cause a computer
to run in 16-bit mode, which could generate a
buffer underrun. Update virus software to the
latest version.
3. Close all background running programs and TSRs
(terminate and stay resident).
Programs running in the background use up system
resources and can cause interruptions in the
writing process. Closing all open applications may
help prevent buffer underruns. To check which
applications are currently running, hold down the
CTRL and ALT keys, and press the DEL key once.
This will open the Task Manager in Windows NT.
The only program on this list necessary for
Windows to work is Explorer. By highlighting the
other items on this list one at a time and
choosing End Task in the lower corner, the
highlighted application will be taken out of
memory. After pressing End Task, the Task Manager
dialog box will close. To again open the Task
Manager dialog box, press the CTRL - ALT - DEL key
combination again. This operation of opening the
Task Manager dialog box and ending task on items
should be repeated until only Explorer is left
running in the background.
4. Turn off power management in the computer's BIOS
and in Control Panel.
If Power Management is enabled for the computer,
the hard drive may spin down and the processor
will clock down, causing the CD-Writer to generate
a buffer underrun. To turn off Power Management in
the Control Panel go to Start, Settings, Control
Panel, and Power Management or Power Options.
Consult the computer manufacturer's user manual to
learn how to enter the BIOS, or CMOS, or System
Setups to disable power management.
5. Disable any screen savers in use.
To de-activate the screen saver, go to Start,
Settings, Control Panel and double-click the
Display icon. Select the Screen Saver tab when the
Display dialog box appears and set the screen
saver option to None.
6. Slow down the write speed.
This suggestion is made as a workaround to achieve
a successfully written disc and to test the
hardware functionality of the CD-Writer. HP's
intent is not to ask customers to settle for
something less than expected in terms of writing
speed, but rather to establish the ability of the
CD-Writer to perform at any level and to proceed
toward optimizing the writing speed. This will
give the system a few seconds longer to get the
data from the source drive to the CD-Writer. There
may be problems copying certain files and slowing
the record speed will help with these files. You
have the ability to choose a writing speed when
the dialog "Create a CD" appears. If successful
when using a slower writing speed, then more
investigation into possible causes for data
slowdowns or interruptions is necessary to achieve
faster writing speeds.
Good luck!!
Disclaimer: Deze text komt van HP. HP neemt geen enkel verantwoordelijkheid voor foutjes en dergelijke. Ook is het verboden om te kopieren ensow..
:strip_exif()/u/6451/avatar1.gif?f=community){kind=avatar}
/u/26921/zelda3.png?f=community)
/u/13831/icon.png?f=community){kind=icon}
:strip_icc():strip_exif()/u/6685/crop61330c2db3693_cropped.jpg?f=community)
:strip_icc():strip_exif()/u/12401/crop62ebeb663c6e7_cropped.jpg?f=community)
:strip_exif()/u/26440/blacksmith.gif?f=community)
:strip_exif()/u/41269/got_icon.gif?f=community){kind=icon}