Large file transfer stops working when using USB hard drive and Windows 7 64 bit, Intel chipset

Just to let people know I have now tried after installing Service Park 1 for Windows 7 x64 and the problem still exists so sadly the Service Pack doesn't help. Really need this fixing as it's a nightmare having to use my Laptop (with x86 Windows 7 and 2Gb RAM) to copy large files to USB (over the network from the problem machine) or CRC check everything.

I think it's reasonable to want to have confidence in the data transfers. :P

I have been having a similar issue with a Western Digital external hard drive.  When trying to copy large (>1 Gb) files or a large batch of small files with Windows Explorer, the copying cycle freezes part way, and cancelling it puts it in an endless loop until I physically disconnect the external drive. While I can read the directory, I cannot transfer files over. I have used a freeware utility called "Roadkil's Unstoppable Copier 5.2" which is able to copy the files, although it will get very slow at times, then speed up again. It seems that Roadkil will tolerate drive slowdowns in order to read the data, whereas Windows Explorer (Win7 Ultimate 64) does not. I have a feeling the HD is going to die soon; luckily I have been able to pull the files off so far.

Cytopia: I have had nothing but problems with nForce chipsets on motherboards. NVidia makes great graphics cards, but they know nothing about motherboards. I had a i780 chipset motherboard which had a video corruption bug (youtube videos and small .wmv files would corrupt, then the system would freeze and a cold boot was necessary). In spite of this problem, NVidia *still* hasn't fixed the problem. I switched to a x58 chipset and never looked back. I would never, ever buy a motherboard with an nForce chipset in my lifetime!

I am having this issue or atleast a similar issue with Windows 7 (Enterprise and Professional, x64, 4Gb RAM, Intel/NEC Chipset for USB).

I cannot copy large files with any confidence to any USB drives on either my work PC (RM machine with Windows 7 x64 Enterprise, 4GB RAM Intel USB Controller) or home PC (Windows 7 x64 Professional, 4GB RAM, Intel USB Controller and NEC USB controller).

I do not experience any lock ups or system errors however large files (4GB+ for example) stand a 50/50 chance of being currupted during transfer. I have checked this repeatedly using MD5 checksums.

I also have a Windows 7 Toshiba laptop (2GB RAM, Windows 7 Professional 32-bit, Intel USB Controllers) and do not experience any issues at all.

It does not matter which of my many USB devices I use the problem occurs whether it's a cheap USB enclosure or a Western Digital, Maxtor external HDD. I can copy 6 files and 2 be currupted then re-copy them and have different files currupted. The file system is fine with all disk checks reporting no issues. The filesystem does not show any issues but the files are indeed currupted. The files also report the correct size.

If I remove the HDD's from the USB enclosures and use an eSATA enclosure the problem goes away.

This appears to be the same issue as KB976972 which is as follows:

"You encounter problems when you move data over USB from a Windows 7 or Windows Server 2008 R2-based computer that has an NVIDIA USB EHCI chipset and at least 4GB of RAM"

However this does not seem to only be an issue to nvida USB controllers.

To summarise: The affected systems both have x64 Windows 7, Both have Intel controllers (one has NEC controller too which seems to also be affected), Both have 4GB RAM. Curruption is random. All external HDD's are using NTFS (No choice there due to FAT32's filesize limitation anyway). Deffinatly seems to be an issue with Windows 7 x64 and 4GB+ RAM. Can transfer 20GB of small files (say 100Mbyte) no problems, transfer 1 20GB file and curruption.

In this day and age I am surprised this issue has not been corrected sooner. Many people are reporting the issue on the web (google searches). I use a lot of large image and video files and this bug is driving me nuts as I have to constantly be aware of how I transport files around.

They finally fixed it for the Acer 8735G with a BIOS update