Hello.\n\nI own a P4C800-E Deluxe motherboard, with Windows XP SP2 installed. I\nrealize it's an old motherboard, but I can't afford to purchase a new\ncomputer. I'm hoping to get a few more years out of this one. :)\n\nThe issue has to do with a little over one year old Rosewill 'R2-JBOD'\nexternal enclosure (self powered). The Rosewill is configured as JBOD,\nwith two Western Digital WD1002FBYS-02A6B0 1TB drives installed. The\nRosewill is connected directly to one of the motherboard USB ports.\nWindows has the drives configured for quick removal and I always use the\n'Safely Remove Hardware' to dismount the device. The Rosewill has worked\nflawlessly for about a year in it's present configuration.\n\nAbout one month ago, I went to defrag the Rosewill drives and several\nminutes into the defrag I receive a pop-up that said there was a\n'Delayed Write Failed', that data was "lost". I tried various things,\nbut in the end what I thought solved the issue was a thorough cleaning\nof the inside of the computer case and the Rosewill enclosure. The issue\nimmediately stopped after the cleaning. At the time I used the drives\nfor approximately a couple more days without issue and the Rosewill was\nthen powered down.\n\nOne week ago I needed the Rosewill drives, and used them continuously\nfor four (4) days solid, until I needed to reboot the computer. After\nrebooting, I decided to defrag the drives and I once again received a\n'Delayed Write Failed'. I have been defragging the system and USB drives\nwith PerfectDisk for years without any issues.\n\nTypically when there is a 'Delayed Write Failed' it says which folder is\n"lost" and if I check that folder, all the files are gone. However, if I\nreboot the computer, all the files are back and they are completely\nintact. Which folder and which files are missing, change as I reboot the\ncomputer. It's as if whatever is causing the issue, at that specific\npoint in time, is what's "lost". Also, most of the time I can hear the\nWindows drive un-mount chime and immediately the mount chine -\- like the\ndrive is momentarily dropping and coming back.\n\nI've used CHKDSK when the 'Delayed Write Failed' has occurred and\nespecially when the files are supposedly missing and it reports that\nthere is nothing wrong with the drive. It seems whenever I use CHKDSK\nnothing is ever found. Maybe I need better hard drive checking software,\nwhat would you recommend?\n\nThe only other odd thing to happen recently was during one of the\nreboots I received a BSOD. The error was 'UNMOUNTABLE_BOOT_VOLUME'\n(Stop: 0x000000ED). According to Microsoft they say that this error\nmessage occurs "When Volume on IDE Drive with Caching [is] Enabled".\nThey also say that this issue was fixed with Windows XP SP1, I have SP2.\nI checked the boot drive with CHKDSK and CHKDSK again reports no errors.\nAnd, it could be a coincidence, since in all these years it has only\nhappened twice, with a fair amount of time passing by and with several\nboots in-between.\n\nSome other things I've tried include:\n\n1) Moving the USB cable for the Rosewill to one of the other seven\nmotherboard USB ports.\n\n2) I've tried a different USB cable that's currently used for a\ndifferent brand of USB enclosure, which works fine with that drive.\n\n3) I've removed the outer shell of the Rosewill to allow better air flow\nand the metal hard drive mounting frame is only warm to the touch.\n\n4) Rosewill fan is enabled.\n\n5) I've cycled the USB connector into the Rosewill and motherboard ports\nhoping to clear any possible oxidation. In addition, made sure that\nthe BIG and JBOD mode switch inside the Rosewill was firmly set to\nJBOD by cycling the switch back and forth.\n\nOther than these two issues, the computer is working fine. I don't know\nif it's a motherboard (USB) issue or a enclosure (hard drive) issue.\nHence, posting to two Newsgroups, with followup set. Sorry for the\nlength of this post, I was trying to be as thorough as I could. If I\nmissed any important details, please let me know.\n\nThank you.