When i insert pen drive to my aspire5100, the system is hanged and also not recognise my pen drive

try another pen drive which is good and your pen drive try with another system

run compatibility wizard and chose that flash drives to run as / chose different settings,
usually caused by older flash drive drivers

check manufacturers web site for compatible drivers/ upgrades

you might have not inserted the pen drive correctly. You should also try to insert the pen drive in some other USB port

remove the USB drive, reboot your system and plug the drive in...

If system still doesn't recognise the device, update your chipset from your manufacturer's website.

does other usb devices work fine on the same system please check if your pen drive is working fine on some other pc/laptop if it is working fine then you have to check with your usb ports.

solution..
1) Check The USB Port for Damaged, Bend Or Broken Pins.
2) Check The Pen Drive For Physical Damage.
3) Try The Pen Drive In another USB Port. (i.e. if u r using the pen drive in the FRONT PANEL USB PORT than try it in BACK PANEL USB PORT)
4) Try The Pen Drive In Another System.
5) Tye Another Pen Drive.
6) If All Above Is Fine Then Format The PEN DRIVE.
7) Try The PEN DRIVE now.
8) Is Issue Still Persists Then..
9) Uninstall the CHIPSET/MOTHERBOARD DRIVER COMPLETELY and then clear %temp% & prefetch files and Restart Your System.
10) Install The Latest CHIPSET/MOTHERBOARD DRIVER and ANY AVAILABLE FIRMWARE for the motherboard..

No need to worry, I will solve your problem follow this link to find how to solve it http://www.fixya.com/support/r4391734-usb_flashdisk_pen_drive_write_protect

when insert pen drive system being hang

i have 4gb moserbaer pen drive when i inserted it in to the Xp system it give the message "Insert disk"
plz. solve this problem.

Hi,
Most probably this may be a loose connection problem... and ur drive has a autorun program...

Situation may be like this...1. ur drive is recognised..2. Autorun starts...3. Drive disengages :))...4. OS asks u -->WHERE IS MY DRIVE???<--

Try using some other USB ports...and in some other PCs also...Try to have a thorough scan with good antivirus (Who knows.. may be some virus is running as autorun!)

Try connecting the device in all possible insertion levels


Bye

Have a nice day.

I hope ... this solves ur problem. :)