short read of zdata file

Sameer Verma sverma at
Fri Jan 13 03:21:02 EST 2012

On Wed, Jan 11, 2012 at 1:05 PM, James Cameron <quozl at> wrote:
> On Wed, Jan 11, 2012 at 12:51:48AM -0800, Sameer Verma wrote:
>> I'm seeing a "short read of zdata file" on running fs-update on a 1.75
>> using os23.zd4
>> Any suggestions?
> Reflash to the current firmware.  For an XO-1.75 B1, that is Q4C12.
> Then try again.
> If the problem persists, then consider this explanation.
> The zdata file, the os23.zd4 file, contains block headers then block
> data.  Each block header describes the length of data that follows.  If
> the length is shorter than the remaining length of the file at that
> point, you get "Short read of zdata file".
> The most likely causes of this message are:
> 1.  the file is missing data from the end, usually caused by incomplete
> download, so check the file size is 766009232 bytes, and if it is less
> then resume the download from where it left off, see
> for methods,
> 2.  the file has a corrupted block header, usually caused by corruption
> during download, so check the md5sum is
> 26c565b19c1b5465c421183cdd771546, and if it is incorrect then correct it
> using one of the methods at
> 3.  the USB drive could not be read by OpenFirmware, resulting in a
> premature close of the file ... if so there should be some preceeding
> message, please report it.  Otherwise, try using OpenFirmware to read
> the file and copy it, then check the copy with another computer, e.g.
>        ok copy u:\os23.zd4 u:\copy.zd4
> --
> James Cameron
> _______________________________________________
> Devel mailing list
> Devel at

md5sum checked out, but changing the USB stick fixed the problem. Not
sure why. Running on Q4C08


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