+1 Clean the disks very gently. I've just bought SH4 (vanilla) and have two workstation PCs with DVD-RAM drives that just won't read some brand new disks.
I generally put these disks into a PC with a much older DVD drive and copy the contents onto a hard drive. Either using a direct file by file copy (i.e. Select All, Copy and Paste), or using a CD/DVD image making utility (e.g. Alcohol 120%).
Hope this helps; good luck.
Mac
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