Martin Steigerwald - 28.06.18, 13:30: > jdow - 28.06.18, 12:00: > > On 20180628 01:16, Martin Steigerwald wrote: > […] > > > >> That brings to the fore an interesting question. Why bother with > > >> RDBs > > >> over 2TB unless you want a disk with one single partition? This > > >> Win10 > > >> monster I am using has a modest BIOS driver partition for the OS > > >> and > > >> a giant data partition. That smaller partition would easily work > > >> with > > >> any RDB/Filesystem combination since 2.0. So there are some good > > >> workarounds that are probably "safer" and at least as flexible as > > >> RDBs, one Linux has used for a very long time, too. > > > > > > Well, my use case was simple: > > > > > > I had this 2 TB disk and I choose to share it as a backup disk for > > > Linux *and* AmigaOS 4.x on that Sam440ep I still have next to me > > > desk here. > > > > EEEEEEK! The hair on my neck is standing up straight! Have you heard > > of SAMBA? The linux mail server firewall etc machine has an extra > > 4TB > > disk on it as a backup for the other systems, although a piddly 4TB > > is small when I save the entire 3G RAID system I have. It's a proof > > of concept so.... A full backup on a 1gig Ethernet still takes a > > looooong time. But backing up even an 18GB disk on an Amiga via > > 100Base-t isn't too bad. And disk speeds of the era being what they > > were it's about all you can do anyway. > > Heh, the thing worked just fine in Amiga OS 4. I got away with it > without an issue, until I plugged the disk to my Linux laptop and > wrote data onto the Linux file system. Mind you, I think in that > partition marked LNX\0 I even created a Linux LVM with pvcreate. Do > you call that insane? Well it probably is. :) > > And as an Amiga user I could just return to you: I clicked it, it did > not warn, so all is good :) > > But yeah, as mentioned I researched the topic before. And I think > there > has not even been an overflow within the RDB: > > The raw, theoretical limit on the maximum device capacity is about > > 2^105 bytes: > > > > 32 bit rdb_Cylinders * 32 bit rdb_Heads * 32 bit rdb_Sectors * 512 > > bytes/sector for the HD size in struct RigidDiskBlock > > http://wiki.amigaos.net/wiki/RDB_(Amiga_Rigid_Disk_Block) > > Confirmed by: > > The .ADF (Amiga Disk File) format FAQ: > http://lclevy.free.fr/adflib/adf_info.html#p6 > > But what do I write, you know the RDB format :) > > So just do the calculation in 96 Bit and you all are set :) For sectors. Or 3*32+9 (for 512 bytes per sector) = 105 bits for bytes. > Now that is a reason for 128 Bit CPUs :). > > Muuhahaha. -- Martin
