Thank you for your reply.
I don't think erasing makes sense because I used an brand-new:) disc first, as I wrote.
But I'll try later.
The below is the message on the right when I inserted the HD DVD-RW medium in the write mode.
This medium supports AACS.
Please feel free to request me additional information.
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TOSHIBA DVD/HDW SD-L912A TF30 (ATA) Current Profile: HD DVD-RW Disc Information: Status: Empty State of Last Session: Empty Erasable: Yes Free Sectors: 7,361,600 Free Space: 15,076,556,800 bytes Free Time: 1635:56:50 (MM:SS:FF) MID: RITEK-HD-RW-S11 Supported Write Speeds: 1x Disc Manufacturing Information: Manufacturer: RITEK CORPORATION Manufactured: TAIWAN Manufacturer ID: RITEK-HD-RW-S11 Physical Format Information (Last Recorded): Book Type: HD DVD-RW Part Version: 3 Disc Size: 120 mm Maximum Read Rate: Not Specified Number of Layers: 1 Track Path: Parallel Track Path (PTP) Linear Density: 0.153 um/bit Track Density: 0.40 um/track First Physical Sector of Data Area: 196,608 Last Physical Sector of Data Area: 0 Last Physical Sector in Layer 0: 0 Format Capacities: DT: 0x01 - NB: 7361600 (0x00705440) - TDP: 2048 FT: 0x00 - NB: 7361600 (0x00705440) - TDP: 2048 FT: 0x10 - NB: 7361600 (0x00705440) - TDP: 32 FT: 0x15 - NB: 7361600 (0x00705440) - TDP: 32 FT: 0x19 - NB: 7361600 (0x00705440) - TDP: 32 Performance (Write Speed): Descriptor 1... -> B0: 0x00, B1: 0x00, B2: 0x00, B3: 0x00 -> EL: 7361599 (0x0070543F) -> RS: 4,568 KB/s (1x) - WS: 4,568 KB/s (1x)