hello Daniel, i have tried ALL!
all is disable: battery, wireless, bluetooth, internet connection..
the thing that is strange is that when i have the clicks and the error message in samplitude of lost asio buffer, DPC is always ok, always green hystogram!!!!
thanks a lot..i will think what to do.
Alex.

What do you mean by "64 kb blocksize" for your harddrive? Clustersize? Why so big? This could be a culprit.

If you are using the full version of Samplitude you could try the high Priority switch in its settings. Maybe some other process if stealing CPU time when it's needed by Samplitude (even with 30-40% CPU load "only").

Using the pagefile is no problem unless Windows is *actively* paging data in/out to the file *while* you are doing your audio work. In that case you are spoiled = get more RAM. But before you start buying stuff: Do the dropouts occurs with only using effects that don't use any much RAM and HD access?

thanks a lot.
i ve tried with cubase but the problem is the same. when i use WDM and not ASIO it seems that the problem is solved....
with ASIO, i have problems for example if i only open samplitude. only espanding and reducing the windows of samplitude i listen clicks and i have asio buffer error.
the same with cubase.
at the end of the week i will connect fireface 800 to an texas instruments PCMCIA in order to avoid using the 4 pin firewire port of my computer.
i will try also the pc in a more controlled environment to consider a possible electricity problem.

About:
Using the pagefile is no problem unless Windows is *actively* paging data in/out to the file *while* you are doing your audio work. In that case you are spoiled = get more RAM. But before you start buying stuff: Do the dropouts occurs with only using effects that don't use any much RAM and HD access?
i will install windows 7 in order to use latencymon to see if in the pagefaults report, samplitude appears.
i will put here the report of latencymon as soon as possible.
thanks a lot for the very good support.
Alessandro.

hello friends, here the analysis:

with only one stereo track in playback with a multiband dyn effect and 256 of buffer i find click moving windows and sliders of the plug in.

in samplitude i see:
DSP: 2%
disk: 3-4%
error asio buffer

in the fireface settings:
there are not errors.

in windows 7 monitor system
CPU: 55%
physical ram: 73%

in DPC software: around 500 millisecond of latency

in latencymon software:

highest DPC: 284
highest ISR: 42
no pagefaults in samplitude

my computer have all texas instruments chipset 1 giga of ram and core duo 2 with 1,66 Hz.

based on this analysis, do you find something strange in order to explain my click audition?

thanks Alessandro.

i have just made a test.
it was latencymon to put CPU at 55%.
closing latencymon the computer is working with samplitude at very low CPU loaded (around 20% with a project not small...).
samplitude is the only software installed in the notebook after a fresh windows 7 installation.
if considering the test i have made it can't be neither CPU, RAM or hard disk, considering all is chipset TI, for me it is all very strange...
i will test this notebook in another house, to see if it could be electricity problems in my house...and if the problem follows i will try another notebook. but for me it is very frustrating changing a notebook that in the charateristics is all perfect for audio. if now i would think to a computer for audio, i would think to high HP series, considering HP works in collaboration with TI.
rotfl
thanks to all for the help.
Alessandro.

i have found the problem!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
:-)
my sister has an amatorial maudio fasttrack usb soundcard.
i have just tried it.
i have put it to 128 sample (the maximum it can reeach) with a very big project in samp and a lot of plug in moving the slider...
NO PROBLEMS!!All is perfect.
i hope it is problem with the small 4 pin firewire connection of my hp.
on the other hand at the end of the week i will try a PCMCIA firewire card with TI chispet in my pc.
i hope this will solve all..or the problem is in the RME fireface.
thanks Alessandro.

for the benefit of people with problems similar to mine...
i have update the ram to 3 giga but clicks again. the upgrade of RAM din't solved problems.
then i have solved all my problems and now my HP is a rock solid DAW with NEVER an asio lost buffer by upgrading the hard disk from an hitachi 5400 rpm to a segate momentus 7200 rpm.
best regards,
Alessandro.

i have installed the "storage intel rapid" for the motherboard.
i have installed the driver of the graphic board.
disable battery, ethernet, wireless and all the common things for optimization.
i have not made any change in the BIOS. all is at default settings with SATA enabled.
about RAID i don t know what it means..excuse me.
all above mentioned was also made before changing the hard disk, but without solving the problems of clicks.
the problems of clicks was solved changing the har disk.
i have to say that in samplitude manual they not give importance to RAM or CPU, but they raccomand a MINIMUM fo 7200 rpm with 9ms or less of access time.
my segate is 11 ms of access time, but it works very well.
Alessandro.

General Information                                                             
Drive Controller:                                                               Serial ATA 3Gb/s
Drive Model:                                                                    Seagate ST9500420AS
Drive Revision:                                                                 0002SDM1
Drive Serial Number:                                                            5VJAFL36
Drive Capacity:                                                                 476,940 MBytes (500 GB)
Media Rotation Rate:                                                            7200 RPM

Drive Geometry                                                                 
Number of Cylinders:                                                            16383
Number of Heads:                                                                16
Sectors Per Track:                                                              63
Bytes Per Sector:                                                               Unknown
Bytes Per Track:                                                                Unknown
Number Of ECC Bytes:                                                            4
Number of Sectors:                                                              16513875
Total 32-bit LBA Sectors:                                                       268435455
Total 48-bit LBA Sectors:                                                       976773168
Cache Buffer Size:                                                              16384 KBytes
Controller Type:                                                                Not Specified

Transfer Modes                                                                 
Sectors Per Interrupt:                                                          Total: 16, Active: 16
Max. PIO Transfer Mode:                                                         4
Multiword DMA Mode:                                                             Total: 2, Active: -
Singleword DMA Mode:                                                            Total: -, Active: -
Ultra-DMA Mode:                                                                 Total: 6 (ATA-133), Active: 6 (ATA-133)
Max. Multiword DMA Transfer Rate:                                               16.7 MBytes/s
Max. PIO with IORDY Transfer Rate:                                              16.7 MBytes/s
Max. PIO w/o IORDY Transfer Rate:                                               16.7 MBytes/s
Transfer Width:                                                                 16-bit
Native Command Queuing:                                                         Supported, Max. Depth: 32
TRIM Command:                                                                   Not Supported

Device flags                                                                   
Fixed Drive:                                                                    Present
Removable Drive:                                                                Not Present
Magnetic Storage:                                                               Present
LBA Mode:                                                                       Supported
DMA Mode:                                                                       Supported
IORDY:                                                                          Supported
IORDY Disableable:                                                              Supported

Features                                                                       
Write Cache:                                                                    Present, Active
S.M.A.R.T. Feature:                                                             Present, Active
Security Feature:                                                               Present, Inactive
Removable Media Feature:                                                        Not Present, Disabled
Power Management:                                                               Present, Active
Advanced Power Management:                                                      Present, Active
Packet Interface:                                                               Not Present, Disabled
Look-Ahead Buffer:                                                              Present, Active
Host Protected Area:                                                            Present, Enabled
Power-Up In Standby:                                                            Not Suppported, Inactive
Automatic Acoustic Management:                                                  Supported, Active
48-bit LBA:                                                                     Supported, Active

Self-Monitoring, Analysis and Reporting Technology                             
Raw Read Error Rate:                                                            118/6, Worst: 99 (Data = 195966000)
Spin Up Time:                                                                   98/85, Worst: 98
Start/Stop Count:                                                               100/20, Worst: 100 (Data = 11)
Reallocated Sector Count:                                                       100/36, Worst: 100
Seek Error Rate:                                                                100/30, Worst: 253 (Data = 290667)
Power-On Hours/Cycle Count:                                                     100/Always OK, Worst: 100 (Data = 7)
Spin Retry Count:                                                               100/97, Worst: 100
Power Cycle Count:                                                              100/20, Worst: 100 (Data = 10)
End to End Error Detection Count:                                               100/99, Worst: 100
Reported Uncorrectable Errors:                                                  100/Always OK, Worst: 100
Command Timeout:                                                                100/Always OK, Worst: 100
High Fly Writes                                                                 100/Always OK, Worst: 100
Airflow Temperature / Exceed Count:                                             78/45, Worst: 62 (Data = 22.0 °C)
G-Sense Error Rate:                                                             100/Always OK, Worst: 100
Power-Off Retract Count:                                                        100/Always OK, Worst: 100 (Data = 1)
Load/Unload Cycle Count:                                                        100/Always OK, Worst: 100 (Data = 154)
Temperature                                                                     22/Always OK, Worst: 40 (Data = 22.0 °C)
Hardware ECC Recovered:                                                         48/Always OK, Worst: 48 (Data = 195966000)
Current Pending Sector Count:                                                   100/Always OK, Worst: 100
Off-Line Uncorrectable Sector Count:                                            100/Always OK, Worst: 100
UltraDMA/SATA CRC Error Rate:                                                   200/Always OK, Worst: 200
Head Flying Hours:                                                              100/Always OK, Worst: 253 (Data = 6)
Lifetime Writes from Host:                                                      100/Always OK, Worst: 253 (Data = -1446878101)
Lifetime Reads from Host:                                                       100/Always OK, Worst: 253 (Data = 1862965823)
Free Fall Protection:                                                           100/Always OK, Worst: 100