Windows 7 Forums

Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.


Windows 7: High I/O causes drives to disappear, garbled displays, USB malfunctio

15 Nov 2015   #11
Circle

Windows 7 Pro x64
 
 

An update concerning the Altera DE2 board.

If the Altera board is plugged into mains power before the USB cord, it will knock the USB controller out. When the Altera USB cable is unplugged from the system, the mouse will resume operation. But the keyboard will not come back online. To make the keyboard work again the computer has to be shut down and power has to be unplugged from the system for 10ish seconds before it will work again.


My System SpecsSystem Spec
.
15 Nov 2015   #12
Mellon Head

Win 7 Pro x64/Win 10 Pro x64 dual boot
 
 

I thought that the DE2 was USB powered as well as mains. So you wouldn't have to plug the mains in at the same time as the USB. I was under the impression that the board did not require external power unless it was driving something with high current requirements.

That being said, I could be wrong, I don't own one. But you would think that the two supplies would be isolated from each other, so that the USB ports would not be damaged when an external power source was plugged in. I've been considering buying a DE2. I may reconsider.
My System SpecsSystem Spec
Reply

 High I/O causes drives to disappear, garbled displays, USB malfunctio




Thread Tools Search this Thread
Search this Thread:

Advanced Search




Similar help and support threads
Thread Forum
Logical Drives disappear - how does this happen?
My wife tells me this morning that her data drive disappeared. I check out her laptop and sure enough, her data drive D: and her Image drive E: are not shown in Windows Explorer or My Computer. I look in Disk Management and the space that was occupied by those 2 volumes is now a Green box and...
Hardware & Devices
Secondary hard drives disappear
I am running Windows 7 Ultimate with a 500 GB SSD hard drive. I have a 1.5, 2, and a 4 TB internal drive as data drives. After a period of time, these secondary drives disappear. Only to re appear when machine is re booted. I have tried reseating cables, and also switching cables around. ...
Hardware & Devices
2 hard drives disappear randomly
I have been reading threads in here for a week or so that seem to have sililiar problems but, a little different. The PC I'm having the issue with is not the 1 in my Bio it is Asus M4A875-5 AMD Phenom X4 9850 2.5 GHz 4GB Kingston PC6400 800mhz ramm Raygo ATX mid size tower with 450 watt...
Hardware & Devices
Hard Drives Disappear
Hi All, I have 3 drives installed on my PC (1) solid state drive for the O.S. Win 7 Pro; dual booting on a VHD Win 8 Pro (which I really like). The other two SATA drives are for storage (1) 500 gig partitioned in two and (1) 320 gig not partitioned. Here's my problem: Periodically the SATA...
Hardware & Devices
DVD drives disappear after Windows 7 install
This is strange - AND driving me nuts. After a green light from the Windows 7 upgrade advisor, I installed Windows 7 Ultimate x32 on an HP Pavilion a6530f. I expected some software issues, and chose the 32-bit version to keep those to a minimum. The machine belongs to a client who is quite...
Hardware & Devices
Media Center doesn't like high-res displays
My primary display is a 30" 2560x1600 LCD. When I start up Media Center for the first time it pops up a dialog telling me that my display is running at too high a resolution, which may affect Media Center performance, and that I should close Media Center and reduce the resolution. I ignored the...
Media Center


Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 11:36.

Twitter Facebook Google+



Windows 7 Forums

Seven Forums Android App Seven Forums IOS App