Hi, Scott Edwards wrote: > xorriso : NOTE : Disc status unsuitable for writing (weird) > Drive current: -outdev '/dev/sr1' > Media current: BD-ROM > Media status : is written , is closed > Media summary: 1 session, 46769024 data blocks, 89.2g data, 0 free
The drive announces the medium as BD-ROM because it was closed after burning. It is indeed unwritable now. Some drives might still report it as BD-R, although many BD-R activities won't work with it any more. If you had used -as cdrecord option -multi, then it would have staid appendable, i.e. another session could be written to the yet unwritten part of the medium. On the other hand, not all BD-ROM drives would be willing to read from an appendable BD-R. The decision for the default mode in cdrecord emulation was made by original cdrecord about 30 years ago. In xorriso's native command mode the default is not to close the medium after writing. So if you ever use xorriso's native command set to compose an ISO filesystem from disk files and want to close the medium, then you'd need to issue xorriso command -close "on". > > I don't have many user reports about multi-layer BD. > It might be QL by assumption. K3B thought there was one layer (virtually?). The size you reported indicates triple-layer BD-R. Four layers would be "128 GB". (Amazon advertises the MATSHITABD-MLT UJ272 with "100 MB" maximum capacity.) Other than with DVD+R DL, the multi-layer BD-R media are reported by the drive with the same "profile" number 0x41 as single-layer BD-R. The only difference visible to a burn program is the higher medium capacity compared to single-layer. Especially the jump from layer to layer is supposed to be invisible to the burn programs. It may cause a short drop in writing speed, though. > https://a.co/d/gzaJCLv Says "Ritek BD-R XL BDXL 100GB Archival Grade Triple Layers 4X". They don't want to tell me a price because they won't deliver it to germany. Others want around 125 USD. Not much more per GB than single-layer "25 GB" BD-R. The main disadvantage is the slow write speed of BD-R XL. > xorriso : UPDATE : Closing track/session. Working since 10733 seconds Three hours. > Media summary: 1 session, 46769024 data blocks, 89.2g data, 0 free Write speed was 46769024/512/10733 = 8.51 MiB/s. That's 1.9851 x BD speed. I assume that writing started with less than 2x speed and then accelerated slowly to 4x speed near the end (aka Constant Angular Velocity recording). With single layer BD-R in full-height LG, ASUS, or Pioneer drives i get 5x speed at the start, accelerating to 8x or 10x at the end. For the sake of noise reduction i often curb speed by xorriso command -speed 4 or option speed=4 in cdrecord emulation. That would not be necessary with Ritek BD-R XL 100 GB. Have a nice day :) Thomas
