Chris Murphy wrote: > On Jan 15, 2012, at 1:16 AM, Jim Meyering wrote: >>> parted 2.3 will not resize a journaled HFS+ volume. It says: >>> "Error: The sector size stored in the journal is not 512 bytes. Parted >>> only supports 512 bytes length sectors." >>> >>> The disk is an AF 512e disk. Mac OS X sees the sectors as 512 >>> bytes. The VM sees them as 512 bytes as well. I don't understand what >>> the error is about. >> >> It's complaining that _HfsJJournalHeader.jhdr_size != sector_size (512). >> What is its value for your disk? > > Using hfsdebug, it reports jhdr_size is 4096 bytes.
Thanks. The code (I think I saw this in non-parted code, too) interprets jhdr_size as the disk's sector size. Parted's HFS-resizing code was written for 512-byte sectors, with numerous stack and heap structures hard-coded to that assumption. That is why it rejects any attempt to resize a disk whose sector size appears to be different from 512.
