MSC mode, mass storage class: 

$ udevadm info --query=all --path=/devices/pci0000:00/0000:00:1a.7/usb1/1-4
P: /devices/pci0000:00/0000:00:1a.7/usb1/1-4
N: bus/usb/001/031
E: UDEV_LOG=3
E: DEVPATH=/devices/pci0000:00/0000:00:1a.7/usb1/1-4
E: MAJOR=189
E: MINOR=30
E: DEVNAME=/dev/bus/usb/001/031
E: DEVTYPE=usb_device
E: DRIVER=usb
E: DEVICE=/proc/bus/usb/001/031
E: PRODUCT=781/74e5/aacc
E: TYPE=0/0/0
E: BUSNUM=001
E: DEVNUM=031
E: SUBSYSTEM=usb
E: ID_VENDOR=SanDisk
E: ID_VENDOR_ENC=SanDisk
E: ID_VENDOR_ID=0781
E: ID_MODEL=Sansa_Clip_Zip
E: ID_MODEL_ENC=Sansa\x20Clip\x20Zip
E: ID_MODEL_ID=74e5
E: ID_REVISION=aacc
E: ID_SERIAL=SanDisk_Sansa_Clip_Zip_5D1DFE065286C1A80000000000000000
E: ID_SERIAL_SHORT=5D1DFE065286C1A80000000000000000
E: ID_BUS=usb
E: ID_USB_INTERFACES=:080650:

Make: Sandisk
Model: Sansa Clip Zip

Same as Sansa Clip+


Tested working with these diffs:

[jeffrey_l_mendoza@denjin media-player-info]$ diff -c sandisk_sansa-clip-plus.mpi sandisk_sansa-clip-zip.mpi
*** sandisk_sansa-clip-plus.mpi	2011-03-15 06:32:11.000000000 -0500
--- sandisk_sansa-clip-zip.mpi	2011-12-06 17:19:14.818143574 -0600
***************
*** 1,8 ****
  [Device]
! Product=Sansa Clip+
  Vendor=SanDisk
  AccessProtocol=storage
! DeviceMatch=usb:0781:74d1;
  
  [Media]
  InputFormats=audio/x-wav
--- 1,8 ----
  [Device]
! Product=Sansa Clip Zip
  Vendor=SanDisk
  AccessProtocol=storage
! DeviceMatch=usb:0781:74e5;
  
  [Media]
  InputFormats=audio/x-wav
[jeffrey_l_mendoza@denjin media-player-info]$ 


[jeffrey_l_mendoza@denjin ~]$ diff -c /lib/udev/rules.d/40-usb-media-players.rules~ /lib/udev/rules.d/40-usb-media-players.rules
*** /lib/udev/rules.d/40-usb-media-players.rules~	2011-03-15 06:32:12.000000000 -0500
--- /lib/udev/rules.d/40-usb-media-players.rules	2011-12-06 17:38:02.012194093 -0600
***************
*** 15,20 ****
--- 15,22 ----
  ATTRS{idVendor}=="04e8" , ATTRS{idProduct}=="5133" , ENV{ID_MEDIA_PLAYER}="samsung_u6"
  # Sansa Clip+
  ATTRS{idVendor}=="0781" , ATTRS{idProduct}=="74d1" , ENV{ID_MEDIA_PLAYER}="sandisk_sansa-clip-plus"
+ # Sansa Clip Zip
+ ATTRS{idVendor}=="0781" , ATTRS{idProduct}=="74e5" , ENV{ID_MEDIA_PLAYER}="sandisk_sansa-clip-zip"
  # YP-F2R
  ATTRS{idVendor}=="04e8" , ATTRS{idProduct}=="5051" , ENV{ID_MEDIA_PLAYER}="samsung_yp-f2r"
  ATTRS{idVendor}=="1011" , ATTRS{idProduct}=="0001" , ENV{ID_MEDIA_PLAYER}="mobile-media_0x0001"
[jeffrey_l_mendoza@denjin ~]$ 


The Clip Zip adds support to play AAC files over the Clip+: audio/mp4 I assume.

from: http://www.sandisk.com/products/sansa-music-and-video-players/sandisk-sansa-clip-zip-mp3-player
Supports:
    AAC compatible(DRM-free iTunes)
    Audiobooks
    FLAC
    MP3
    Ogg Vorbis
    Secure WMA
    WMA