He descargado la última imagen de Raspbian desde el sitio web raspberrypi.org en mi Mac con OS X 10.10.5 La suma de comprobación SHA-1 coincide con la que aparece en el sitio web.
Cuando intento extraer usando unzip Me sale el siguiente error
warning [2015-09-24-raspbian-jessie.zip]: 76 extra bytes at beginning or within zipfile
(attempting to process anyway)
error [2015-09-24-raspbian-jessie.zip]: reported length of central directory is
-76 bytes too long (Atari STZip zipfile? J.H.Holm ZIPSPLIT 1.1
zipfile?). Compensating...
skipping: 2015-09-24-raspbian-jessie.img need PK compat. v4.5 (can do v2.1)
note: didn't find end-of-central-dir signature at end of central dir.
(please check that you have transferred or created the zipfile in the
appropriate BINARY mode and that you have compiled UnZip properly)
