james wrote: > On 07/31/2016 12:56 PM, Jörg Schaible wrote: >> Jörg Schaible wrote: >> >>> Hi Daniel, >>> >>> thanks for your response. >>> >>> Daniel Frey wrote: >>> >>> [snip] >>> >>>> I can only think of two reasons, the kernel on the livecd doesn't >>>> support GPT (which is unlikely) >>> >>> That would be really strange. However, how can I prove it? >>> >>>> or you're booting a 32-bit kernel live >>>> USB. I am reasonably certain for drives > 2TB a 64-bit kernel and GPT >>>> are required. >>> >>> No, I've always chosen 64-bit kernels. I wonder what is so special about >>> this partition ... >> >> Currently I wonder, why my system can find the partition at all: >> >> ======================== %< ======================== >> # gdisk -l /dev/sdi >> GPT fdisk (gdisk) version 1.0.1 >> >> Partition table scan: >> MBR: protective >> BSD: not present >> APM: not present >> GPT: not present > > If you have seen my recent thread,
I saw it, but did not read it in depth, because I had the impression, it is mainly about EFI systems. I'll re-read it ... > much of this automounting during > boot(strapping) is flaky that is much of what I have been searching out > is a default (magical) partitioning schema that will eventually lead to > clear documents on the current state of affairs not only with old versus > new motherboards (mbr-->efi) and disk (mbr < 2.2T and gpt >2.2T) > but including all sorts of new arm and other embedded (linux) boards. > > Different forms of Solid State memory are next on my list, with usb (1.x > --> 3.x) being top of the SS memory mediums..... (Sorry I do not have > more atm). > >> Creating new GPT entries. >> Disk /dev/sdi: 732566646 sectors, 2.7 TiB >> Logical sector size: 4096 bytes >> Disk identifier (GUID): 80C04475-9B51-4A44-A52F-1F165AE02695 >> Partition table holds up to 128 entries >> First usable sector is 6, last usable sector is 732566640 >> Partitions will be aligned on 256-sector boundaries >> Total free space is 732566635 sectors (2.7 TiB) >> >> Number Start (sector) End (sector) Size Code Name >> ======================== %< ======================== >> >> However, it's mounted successfully, see system logs: >> >> ======================== %< ======================== >> [22735.626752] sd 13:0:0:0: [sdi] 732566646 4096-byte logical blocks: >> [(3.00 >> TB/2.73 TiB) >> [22735.629255] sdi: sdi1 >> [23414.066315] EXT4-fs (sdi1): mounted filesystem with ordered data mode. >> Opts: (null) >> ======================== %< ======================== >> >> Has anyone ever tried the recovery option of GPT disk to rebuild GPT from >> MBR? > > I see some sort of 'auto correction' by gpt technology to convert many > forms of perceived mbr to gpt to be used by the booting process for > spinning rust. So this issue is not limited to usb medium. I would also > point out that I'd look deeply into the usb specs for the vendor of your > usb sticks, as they do some 'funky things' at the firmware level inside > many of the newer/faster/larger usb devices. It not just dumb memory > like the early 1.x devices. Many are slanted to Microsoft business > strategies. I'm not suggesting that is your current issues. I'm merely > pointing out that some newer usb sticks are systems themselves complete > with firmware so the devices looks like dumb memory. Furthermore, the > silicon vendors provide firmware options to usb sticks vendors (like > Texas Instruments) but also the vendor add to or change the hidden > firmware as meets their multifaceted business objects. Sadly, the NSA is > deeply involved here, as are many nation states and large corporations. > You'd be surprised what youd find in a modern usb stick, should you take > it into a class 6+ clean-room for analysis. The lower the particle count > the more fantastic the tools > to open up silicon and look deeply into what is actually going on. > This is why folks love those classified research facilities that have > govt contract and folks hanging around. Lots of very, very cool toys > you just do not hear about...... Way beyond microscopes built by > physicist..... Actually it is not that modern. ~5 year old Intenso 2GB. I'd be surprised if booting from the stick prevents partition detection of another USB drive, but who knows? Maybe I should burn the iso instead and boot that one ;-) > Prolly not your issue, but still present. Cheap ass usb vendors often > have corner issues that are unintentional, that is why well recognized > vendors of SS memory are the best to deal with, for consistency of > behavior. > > I'd use as many different tools as you can find and read the vendor & > silicon manufacturer's docs to see what you are really dealing with to > ferret out this weirdness. (it's a darn time sync, just so you know). > > > [1] http://www.cleanroom.byu.edu/particlecount.phtml > > hth, > James Thanks, Jörg
