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Can't backup, error code 0x8007045D
I have an HP tx2627cl table notebook (swivel screen), Win 7 Home prem OS, 4GB ram and a Seagate ext HD (75GB free of 279GB) which will not allow me to backup. I get error message 0x8007045D because of "an i/o device error". I can copy files to that external HD (I:), but can't use Windows Backup. I did a check disk of I:/ and got no errors. When I click on Backup to I:/, it starts, says it is creating a shadow copy, runs for a couple of minutes (about 5-6%) then I get the above error message. I have switched USP ports, and tried doing a backup from a "clean boot state" with the recommended settings--all to no avail. Any help would be greatly appreciated.