I went through the forum and noticed there were quite many comments that they encountered the same error msg while backing up to external Hard Disk and yet seems no good solution found yet. Can anyone or Arconis Support help on my below situation ? I want to use my external HDD in wireless environment to do the backup for my 2 notebooks. I encountered error msg " E00070004: Failed to write data to an Archive file. A possible reason maybe poor media quality." when the backup processs went through some 30%. I tried it for both of my notebooks and got the same result. My external hard disk is a new one and I checked my external hard disk using chkdk/r and no problem found before the backup. I am wireless link the external HDD to both my notebooks through an wireless router (SMC brand) and always can write/retrieve data to/from the extenal HDD without problem. However, when it comes to using True Image 9.0 for backup. It just doesn't work in a wireless environment and returned with the error msg. However, when I direct attached my external HDD with USB to my notebooks, the backup with True Image 9 to the external HDD can function without problem. Can I have some really useful advice to overcome the problem for backup through wireless router? Thanks.