Date: Sat, 20 Dec 2008 18:49:45 +0000 From: Frank Mitchell <mitchell@wyatt672earp.force9.co.uk> To: staffslug@staffslug.org.uk, sc@mailman.lug.org.uk, freebsd-chat@freebsd.org, ukfreebsd@uk.freebsd.org Subject: File System Ext2 On DVD+RW Message-ID: <200812201849.45914.mitchell@wyatt672earp.force9.co.uk>
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Hi: Recently I noticed Sun Solaris used CDs with a UFS File System. So I decided to try UFS and Ext2 on Optical Disks. It should work on CD-RW, but I had spare DVD+RW disks, so I decided to get more ambitious. Note that DVDs use 2048-byte Sectors like CDs, but they're handled in Error-Correcting Blocks of 16. You can't expect DVD-RW to work, because DVD-RW only writes complete ECC Blocks. But DVD+RW (like DVD-RAM) can update individual Sectors. FreeBSD UFS1 wouldn't work this way. The FreeBSD Handbook gives instructions for DVD-RAM, and obviously DVD-RAM has a different layout. But OpenSUSE Linux seems okay with Ext2 on DVD+RW. I copied a large Subtree and checked the result using diff -qr. Does anybody have thoughts about this idea? Like: Any disadvantages which haven't occurred to me? Obviously if you're recording Personal Information on Removable Media it might be preferable to use a format which isn't readable under Windows. Faictz Ce Que Vouldras: Frank Mitchell
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