elp: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-current@FreeBSD.org MIME-Version: 1.0 References: <8B8086D4-C68D-4C8A-86F2-C35212823B94@ketas.si.pri.ee> <73b4a16d-30f3-44b6-8477-aaa8e5aff82a@gmail.com> <20251103181232.3d7c8825415f1d2ad3f08c6e@dec.sakura.ne.jp> <20251104032244.f9fbf3cf8d67897a0ea84ac0@dec.sakura.ne.jp> In-Reply-To: From: Tomek CEDRO Date: Thu, 6 Nov 2025 15:15:49 +0100 X-Gmail-Original-Message-ID: X-Gm-Features: AWmQ_bl4C2346jfpPkKnMf5kTH-mVB6I7Hl5ZdF_AnL5ZsekfHqiOxTX7dZbKZU Message-ID: Subject: Re: Why is the DVD image so large? To: Tomoaki AOKI Cc: Sulev-Madis Silber , freebsd-current@freebsd.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Spamd-Bar: -- X-Spamd-Result: default: False [-2.30 / 15.00]; NEURAL_HAM_LONG(-1.00)[-1.000]; SUBJECT_ENDS_QUESTION(1.00)[]; NEURAL_HAM_SHORT(-1.00)[-1.000]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[cedro.info:s=google]; MIME_GOOD(-0.10)[text/plain]; ARC_NA(0.00)[]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US]; MISSING_XM_UA(0.00)[]; MIME_TRACE(0.00)[0:+]; RCVD_VIA_SMTP_AUTH(0.00)[]; RCVD_IN_DNSWL_NONE(0.00)[2607:f8b0:4864:20::b12b:from,209.85.128.178:received]; TO_DN_SOME(0.00)[]; R_SPF_NA(0.00)[no SPF record]; RCVD_COUNT_THREE(0.00)[3]; RCPT_COUNT_THREE(0.00)[3]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; DMARC_NA(0.00)[cedro.info]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_TLS_LAST(0.00)[]; PREVIOUSLY_DELIVERED(0.00)[freebsd-current@freebsd.org]; MLMMJ_DEST(0.00)[freebsd-current@freebsd.org]; DKIM_TRACE(0.00)[cedro.info:+] X-Rspamd-Queue-Id: 4d2PPK5tRTz40tT On Mon, Nov 3, 2025 at 9:57=E2=80=AFPM Tomek CEDRO wrote= : > (..) > Also I just found and ordered to play around: BD-RE XL (100GB > rewritable Sony disk ~17EUR no enclosure) and DVD-RAM (4.7GB Panasonic > disk ~5EUR no enclosure).. lets see if my recorder firmware supports > them and would it be possible to just mount DVD-RAM and read-write as > standard disk but slow :-P Okay just a quick test summary: 1. BD-RE XL 100GB: Not all drives can handle them at all (not even read). Looks like these are called UHD disks and so needs to be the burner. This not only depends on firmware but also hardware optics (even though electronics is the same for different burner models). I have Pioneer BDR-208D that cannot handle them at all, even though it works with BD-RE DL (50GB), XL does not even read. I contacted vendor, they confirmed this disk is and will not be supported because of laser and optics limitations. I found out that "crossflashing" is possible for these burners as unofficial hacky way of flashing one burner firmware to another burner that enables some features like BD-RE XL, but it seems this will be out of spec configuration for the optics anyway. Another burner ASUS BW-16D1HT (fw 3.10) can handle BD-RE XL read/write out of the box. 2. DVD-RAM: Not all drives handle them at all (not even read), even less popular than DVD-RW, hard to find, more expensive, slower, not 8GB. Pioneer BDR-208D does not handle write only read. ASUS BW-16D1HT handles it ~3x write speed. Some older HP DVD burner kind of recognizes disk, writes ~0.1x and always fails with error on formatting, but it may read them. Not sure about this RAM capability yet and how it works on FreeBSD will check in a free moment later. If your drive supports writing to BD-RE XL and DVD-RAM it will also read them, but most drives cannot even read them, so it seems only local backup use cases can be considered, not really portable solution. -- CeDeROM, SQ7MHZ, http://www.tomek.cedro.info