No access to USB hard drive

[Guest]

After having my USB hard drives (LaCie P3) running at the same time as having
my Sony Ericsson connected via USB I got some conflict and a delayed writing
to one of the USB-drives was not possible when shutting them down. Then this
disk is not able to open in the explorer and it has no occupied space when
checking the properties. If I try to open it in explorer I get the message
that the unit is not availible and that it is not ready.

Does anyone have an idea of what the problem is and/or has someone had it?
Will repairing the Master Boot Record from the Recovery Console fix it?

 

[DL]

The master boot record refers to your hd master, boot disk, its not
applicable to the usb drive.
What is shown in Disk Management?

 

[Guest]

Thanks for trying to help!

It says that the disk has 100% free space, the slot for "File system" is
blank (should have been NTFS) and in the "Volume" field theres only the disk
label and not the name I had given it. The capacity is ok and in "Status" it
says it has no faults.

 

[DL]

I believe this might mean that the Master File Table is corrupt.
Usually you would run chkdsk on the drive, whether it will run on a usb
drive, I've never tried.
Spinwrite (google) is another utility that might help