Opened 4 years ago

Closed 3 years ago

#26 closed defect (fixed)

AirBoot displays wrong LVM-drive info when booted with usb-stick inserted

Reported by: Ben Rietbroek Owned by: Ben Rietbroek
Priority: major Milestone:
Component: Boot Manager Version: 1.0
Keywords: lvm Cc:


Multiple OS/2 installations on same drive-letter.
One of them is a PRI partition.
Without stick inserted the drive-letters display OK.
With stick inserted, bogus drive-letter displayed or wrong LVM-hidden status.
Looks like something goes wrong with getting info from Master LVM-record.

Change History (3)

comment:1 Changed 4 years ago by Ben Rietbroek

Owner: set to Ben Rietbroek
Status: newaccepted

comment:2 Changed 4 years ago by Ben Rietbroek

[BIOS geometry of an USB-stick]
The geometry of an USB-stick is determined by the BIOS.
Many BIOSses do *not* use the geometry exposed by the USB-stick, but do some
BIOS-specific translation. So, when an USB-stick CHS is queried using INT13,
these values differ from BIOS to BIOS!

Much of the CHS-code in AirBoot? assumed the BIOS CHS-values were usable, which
is kinda true for regular harddisks, which almost always expose 255/63 geometry.
But for USB-sticks the BIOS CHS-values are *not* usable because of the mentioned
BIOS-specific translation, that does *not* reflect the USB-exposed geometry.

(And even the USB-exposed geometry is often *not* the one used when partitioning)

comment:3 Changed 3 years ago by Ben Rietbroek

Resolution: fixed
Status: acceptedclosed

* This issue is assumed to be fixed *

There is a new release of AiR-BOOT which should fix this issue.
It can be downloaded here:

If this specific issue is *not* fixed, then please create a *new* ticket
here,, describe the problem you
are experiencing and insert a *reference* to this issue if you think it is

Happy booting,


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