Date: Mon, 3 Nov 2025 16:45:24 +0100 From: Tomek CEDRO <tomek@cedro.info> To: Tomoaki AOKI <junchoon@dec.sakura.ne.jp> Cc: Chris <bsd-lists@bsdforge.com>, Lars Tunkrans <drsnx60@gmail.com>, Sulev-Madis Silber <freebsd-current-freebsd-org111@ketas.si.pri.ee>, freebsd-current@freebsd.org Subject: Re: Why is the DVD image so large? Message-ID: <CAFYkXjm0j%2BeehN=1NOCJtiakRCECJN7a%2BKnxMgp1U8b8vknEOQ@mail.gmail.com> In-Reply-To: <20251103215948.e6702b0314189b0943503e58@dec.sakura.ne.jp> References: <d7757e06-1199-42a3-9b41-cc7d210fce0b@blastwave.org> <8B8086D4-C68D-4C8A-86F2-C35212823B94@ketas.si.pri.ee> <73b4a16d-30f3-44b6-8477-aaa8e5aff82a@gmail.com> <b311d5ba0c4dc76977f9161c38d528a5@bsdforge.com> <20251103181232.3d7c8825415f1d2ad3f08c6e@dec.sakura.ne.jp> <CAFYkXjkQ5eu3ST=xTL%2BAsQ9nsckoBVjaLMrz_GEgms49MFUzPg@mail.gmail.com> <20251103215948.e6702b0314189b0943503e58@dec.sakura.ne.jp>
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On Mon, Nov 3, 2025 at 2:00 PM Tomoaki AOKI <junchoon@dec.sakura.ne.jp> wrote: > On Mon, 3 Nov 2025 12:31:42 +0100 > Tomek CEDRO <tomek@cedro.info> wrote: > > On Mon, Nov 3, 2025 at 10:12 AM Tomoaki AOKI <junchoon@dec.sakura.ne.jp> wrote: > > > Another option (far more difficult, though) would be switching > > > to Blu-ray disks. > > > > > > Why difficutlt? Because it would be strongly expected supports for > > > newer UDF that BD requires, if official BD image is provided, > > > even if the media is actually in ISO 9660. And UDF support on FreeBSD > > > is outdated that cannot mount BD. > > > > Hmm I have two 5.25" SATA BD recorders (Pioneer and Asus) using them > > for backups with BD-R (25GB) and BD-R DL (50GB) and BD-RE DL (50GB > > rewritable) disks with no problem. Also tested external USB BD > > recorders work fine but a bit more expensive (looks like Pioneer in > > Europe is sold by Verbatim?). These are not that expensive and can > > burn dvd, cd, and mdisk too. Because DVD-RW-DL are hard to find I just > > bought whole bunch of BD-RE DL and use them in cycles no to waste > > plastic. For clients with one time use BD-R and BD-R DL are fine and > > cheaper. I trust Verbatim disks as there are many different types of > > physical medium just marked BD-R* but burner firmware must support > > them to write correctly. > > Writing ISO9660 into BD* media on BD drive would be fine > if the drive is actually recognized as "writtable". > I've never succeeded writing anything usign USB BD drive > on FreeBSD yet, while reading ISO9660 and DVD in pre-BD version > of UDF are fine and DVD videl playback is OK on the exact same > USB BD drive. > > I had chance to try reading backup BD-R written by BD writer > running on Windows (can read its contents on Windows) on FreeBSD, > without success (too old UDF support). > > Maybe newbies who noticed a BD media (even though it's actually > formatted in ISO9660 or old UDF) is accessible on FreeBSD could > think that FreeBSD can at least read every BD disks unless the disk > is encrypted, which is not true for now. > > > > You just need to create hybrid ISO9660 + UDF (plus -iso-level 3 or 4 > > if you have single files over 2GB) with mkisofs and then burn the > > image with cdrecord or just growisofs or k3b or whatever you prefer. > > Then if you mount it with mount_iso9660 files looks a bit weird, but > > if you mount_udf all looks fine. But this does not seem the case for > > FreeBSD installer as it is simple ISO9660 not even UDF nor hybrid :-) > > > > I also tend to use mdconfig to mount iso and compare files inside iso > > with files to backup before burning just to make sure all landed as > > expected (i.e. sometimes i forget to add -iso-level 3 so big files are > > gone). Then disk verification with iso can be performed after burning. > > > > I found VENTOY [1] extremely helpful because it allows having many ISO > > files on a single USB drive and choose one from its boot menu, it > > supports BIOS and UEFI boot, adding boot keys, and other utilities.. > > so there is no need to have single usb drive per iso anymore just one > > usb drive with many iso :-) > > > > [1] https://www.ventoy.net/ > > > > ps/2: What I really miss about UDF implementation in FreeBSD is modern > > version support with R/W access so we could just use UDF filesystem as > > standard platform independent disk format (i.e. for pendrive in place > > of fat32 / vfat /ntfs). But other systems also have this support > > varying in version support and on the fly write so this is Universal > > Disk Format only in theory and still mainly used for optical disks :-P > > > > -- > > CeDeROM, SQ7MHZ, http://www.tomek.cedro.info > > Exactly. It would be wanted, but maybe lower priority than cutting edge > GPUs and WiFis. Hmm, this update to at least mount and read modern UDF filesystem commonly used on the BlyRay disks sounds like a task for LDWG (Laptop Dekstop Work Group). Forwarding :-) -- CeDeROM, SQ7MHZ, http://www.tomek.cedro.infohome | help
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