Forum: UltraISO
Topic: Unsupported block size, HFS volume will be skipped
started by: clokkevi
Posted by clokkevi on May 15 2005,13:33
I have an "strange" image which is made on Mac OSX.

Instead of being made by Toast (those images always opens fine)
it's tagged with
"DiscRecording 2.1.17f1"

Also, instead of only one "PM" partition map,
located at offset 0x00000200h,

PM.............?Apple...........................Apple_partition_map

there is PM's also at

0x00000400h
PM..............DiscRecording 2.1.17f1..........Apple_HFS

0x00000800h
PM..............Apple...........................Apple_partition_map

0x00001000h
PM.........u.!.+DiscRecording 2.1.17f1..........Apple_HFS


There is also some POSIX stuff:

0x0000A800
..................i...;7..........SP.....ER...I^.IEEE_P1282THE IEEE P1282 PROTOCOL PROVIDES SUPPORT FOR POSIX FILE SYSTEM SEMANTICS.PLEASE CONTACT THE IEEE STANDARDS DEPARTMENT, PISCATAWAY, NJ, USA FOR THE P1282 SPECIFICATION."

And the files and folders after this have both AA and PX, like

MAC OSXAA............PX,
READ ME.RTFAA............PX,
WINDOWSAA............PX,


When I open the image file with UltraISO,
I get the message:

"Prompt

Unsupported block size, HFS volume will be skipped."

The size of the file is 4560584704 bytes,
and since it's a 2048 bytes/sector image, that's exactly
2226848 sectors.

UltraISO shows an apple icon, but that's because it says
APPLE COMPUTER, INC., TYPE: 0002
in the System ID.

The properties says ISO 9660 (greyed out) and Joliet.


What does the
"Unsupported block size, HFS volume will be skipped."
message mean?
What is unsupported block size?
Posted by xoben on May 15 2005,19:23
Quote
What does the
"Unsupported block size, HFS volume will be skipped."
message mean?
What is unsupported block size?

This image has a HFS+ volume, the sector size is 2048 bytes other than 512 bytes of HFS volume.
UltraISO cannot handle this kind of volume yet.
Posted by clokkevi on May 21 2005,22:11
Aha...
So HFS volumes are 512 bytes / sector...
OK, thanks for your reply - and I hope UltraISO will soon support also HFS+, then..! :)