1.5 GB sounds far too low. How large are the PC files when your transfer them to the HD ?
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CDs hold 700MB (that's 0.7 GB) uncompressed.
For ordinary garden-variety DVDs "... single-layer DVD can store 4.7 Gbyte ..."
Blu-Ray has LOADS more space:
...
Variations and sizes
A single-layer Blu-ray disc (BD) can fit 23.3, 25, or 27 GB; this is enough for approximately four hours of high-definition video with audio. A dual-layer BD can fit 46.6, 50, or 54 GB, enough for approximately eight hours of HD video. Capacities of 100 GB and 200 GB, using four and eight layers respectively, are currently being researched; TDK has already announced a prototype four-layer 100 GB disc. [1]
The BD-RE (rewritable) standard is available, along with the BD-R (recordable) and BD-ROM formats, which became available in mid-2004, as part of version 2.0 of the Blu-ray specifications. BD-ROM pre-recorded media are to be available by early 2006.
In addition to 12 cm discs, an 8 cm variation for use with camcorders is planned that will have a capacity of 15 GB. [2]
To ensure that the Blu-ray Disc format is easily extendable (future-proof) it also includes support for multi-layer discs, which should allow the storage capacity to be increased to 100GB