I have bought a five pack of Philips branded CD-RW 74 for UKP3.98 from Staples in the UK. They seem to work great!!

CDRIdentifier gives:

ATIP 97m 27s 10f
Disc Manufacturer Plasmon Data Systems, Ltd.
Reflective layer Phase change
Media type CD-ReWritable
Recording Speeds min. unknown - max. 4X
nominal Capacity 656.10MB (74m 41s 00f / LBA: 335925)

I don't know about "Plasmon data systems" but the CDRW that came with my Liteon burner is:

ATIP 97m 27s 10f
Disc Manufacturer Plasmon Data Systems, Ltd.
Reflective layer Phase change
Media type CD-ReWritable
Recording Speeds min. 4X - max. 8X
nominal Capacity 656.10MB (74m 41s 00f / LBA:335925)

and I've used that as a "scratch pad" for ages with no probs.

RB