Using Ubuntu 9.10 32-bit The issue is even worse... Sometimes when writing data to an USB-Stick everything seems ok. Ubuntu tells no errors, but after running md5sum on both source and destination you will see the files are NOT identical. Sometimes the data transfer just stops as if the copy was ok but only a small amount of the file was copied. I have been aware of this after copying a divx video to my stick and wanted to play it on a standalone player which said: unknown format... I was curious about this... but the stick back in well mplayer was able to play but without the possibility of searching within the file... btw. When enabling the 3D-Desktop or watching a video it is much worse than without. I am using the proprietary driver : NVIDIA-Linux-x86-190.53 My System is: ASRock K10N78FullHD-hSLI CPU: AMD Phenom(tm) 8650 Triple-Core Processor root@ubuntu:/home/ubuntu# lspci 00:00.0 RAM memory: nVidia Corporation MCP78S [GeForce 8200] Memory Controller (rev a2) 00:01.0 ISA bridge: nVidia Corporation MCP78S [GeForce 8200] LPC Bridge (rev a2) 00:01.1 SMBus: nVidia Corporation MCP78S [GeForce 8200] SMBus (rev a1) 00:01.2 RAM memory: nVidia Corporation MCP78S [GeForce 8200] Memory Controller (rev a1) 00:01.3 Co-processor: nVidia Corporation MCP78S [GeForce 8200] Co-Processor (rev a2) 00:01.4 RAM memory: nVidia Corporation MCP78S [GeForce 8200] Memory Controller (rev a1) 00:02.0 USB Controller: nVidia Corporation MCP78S [GeForce 8200] OHCI USB 1.1 Controller (rev a1) 00:02.1 USB Controller: nVidia Corporation MCP78S [GeForce 8200] EHCI USB 2.0 Controller (rev a1) 00:04.0 USB Controller: nVidia Corporation MCP78S [GeForce 8200] OHCI USB 1.1 Controller (rev a1) 00:04.1 USB Controller: nVidia Corporation MCP78S [GeForce 8200] EHCI USB 2.0 Controller (rev a1) 00:06.0 IDE interface: nVidia Corporation MCP78S [GeForce 8200] IDE (rev a1) 00:07.0 Audio device: nVidia Corporation MCP72XE/MCP72P/MCP78U/MCP78S High Definition Audio (rev a1) 00:08.0 PCI bridge: nVidia Corporation MCP78S [GeForce 8200] PCI Bridge (rev a1) 00:09.0 SATA controller: nVidia Corporation MCP78S [GeForce 8200] AHCI Controller (rev a2) 00:0a.0 Ethernet controller: nVidia Corporation MCP77 Ethernet (rev a2) 00:10.0 PCI bridge: nVidia Corporation MCP78S [GeForce 8200] PCI Express Bridge (rev a1) 00:12.0 PCI bridge: nVidia Corporation MCP78S [GeForce 8200] PCI Express Bridge (rev a1) 00:13.0 PCI bridge: nVidia Corporation MCP78S [GeForce 8200] PCI Bridge (rev a1) 00:18.0 Host bridge: Advanced Micro Devices [AMD] K10 [Opteron, Athlon64, Sempron] HyperTransport Configuration 00:18.1 Host bridge: Advanced Micro Devices [AMD] K10 [Opteron, Athlon64, Sempron] Address Map 00:18.2 Host bridge: Advanced Micro Devices [AMD] K10 [Opteron, Athlon64, Sempron] DRAM Controller 00:18.3 Host bridge: Advanced Micro Devices [AMD] K10 [Opteron, Athlon64, Sempron] Miscellaneous Control 00:18.4 Host bridge: Advanced Micro Devices [AMD] K10 [Opteron, Athlon64, Sempron] Link Control 01:09.0 Communication controller: NetMos Technology PCI 9835 Multi-I/O Controller (rev 01) 02:00.0 VGA compatible controller: nVidia Corporation G92 [GeForce 9800 GT] (rev a2) root@ubuntu:/home/ubuntu# cat /proc/interrupts CPU0 CPU1 CPU2 0: 267 3215 651887 IO-APIC-edge timer 1: 2262 1128 2596 IO-APIC-edge i8042 6: 0 1 6 IO-APIC-edge floppy 7: 1 0 0 IO-APIC-edge 8: 0 0 1 IO-APIC-edge rtc0 9: 0 0 0 IO-APIC-fasteoi acpi 14: 3 194 5733 IO-APIC-edge pata_amd 15: 0 0 0 IO-APIC-edge pata_amd 16: 1 8 47 IO-APIC-fasteoi 19: 0 0 12 IO-APIC-fasteoi nouveau 20: 0 0 0 IO-APIC-fasteoi ohci_hcd:usb3 21: 799 61 533 IO-APIC-fasteoi ehci_hcd:usb2, HDA Intel 22: 532 5379 50451 IO-APIC-fasteoi ehci_hcd:usb1 23: 52615 28896 12350 IO-APIC-fasteoi ohci_hcd:usb4 27: 5 61735 935 PCI-MSI-edge ahci 28: 20177 1 41 PCI-MSI-edge eth0 NMI: 0 0 0 Non-maskable interrupts LOC: 467616 144567 16980 Local timer interrupts SPU: 0 0 0 Spurious interrupts PMI: 0 0 0 Performance monitoring interrupts PND: 0 0 0 Performance pending work RES: 916352 773380 598232 Rescheduling interrupts CAL: 2381 3651 4146 Function call interrupts TLB: 71002 5869 10651 TLB shootdowns TRM: 0 0 0 Thermal event interrupts THR: 0 0 0 Threshold APIC interrupts MCE: 0 0 0 Machine check exceptions MCP: 29 29 29 Machine check polls ERR: 1 MIS: 0