Re: Reading HFS Standard Block0 on USB thumb drives
Re: Reading HFS Standard Block0 on USB thumb drives
- Subject: Re: Reading HFS Standard Block0 on USB thumb drives
- From: Mike <email@hidden>
- Date: Fri, 13 Jan 2012 19:56:10 -0700
Thanks Alison,
I tried it on the device in question and it shows 512 bytes of zeros.
Is your device HFS+ formatted or HFS? I am trying to read HFS only (as
described in the old IM: Devices SCSI Manager chapter).
I noticed 'diskUtil list' in Terminal shows that it doesn't recognize
the partition format, yet the 10.6.8 Finder can mount it as read-only
just fine and I see my files on it I copied over from when I formatted
it with Drive Setup on OS 9:
/dev/disk0
#: TYPE NAME SIZE
IDENTIFIER
0: GUID_partition_scheme *1.0 TB disk0
1: EFI 209.7 MB disk0s1
2: Apple_HFS 10.6 569.4 GB disk0s2
3: Apple_HFS Files 269.3 GB disk0s3
4: Apple_HFS Applications 100.8 GB disk0s4
5: Apple_HFS 10.6 FCP X 51.3 GB disk0s5
/dev/disk1
#: TYPE NAME SIZE
IDENTIFIER
0: GUID_partition_scheme *80.0 GB disk1
1: EFI 209.7 MB disk1s1
2: Apple_HFS Files FireWire 79.7 GB disk1s2
/dev/disk3
#: TYPE NAME SIZE
IDENTIFIER
0: untitled *2.0 GB disk3
I know it's formatted correctly because I can see and access the files
on it from Finder.
Thanks,
On 1/13/12 7:49 PM, Alison Cassidy wrote:
I'm no expert, but have you tried running something like 'dd if=/dev/rdisk1 bs=512 count=1 | xxd' from the command-line? I just tried this on an old APM-formatted drive I have here and everything looks okay ....
-- Allie
On Jan 13, 2012, at 6:39 PM, Mike wrote:
> Hi,
>
> I am trying to read a Block0 driver descriptor map from old-style Apple Partition Map formatted USB thumb drives which were formatted using Mac OS Standard (HFS) on OS 9. I am using Xcode 4.2 on 10.6.8.
>
> But when I do the read the entire Block0 structure comes back filled with zeros. I've checked my device open and seek calls and they correctly set to byte offset 0 on the device.
>
> Any idea why this is happening?
>
> Thanks,
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