Public bug reported:

Binary package hint: casper

Ubuntu 7.10 LiveCD copied onto a NFS server.
Booting in vmplayer 2.02 using PXE with persistent option.
Using an Intuix USB mini-HDD with an ext3 filesystem labeled casper-rw.

At 130.0 USB mass storage driver comes up.
At 131.0 unionfs comes up, but HDD is not yet available.
At 131.1 we see the fd0 scan failure from the persistent medium scan (see 
casper.log)
At 135.4 the HDD is available, but scanning of media has finished.

console:
Begin: Mounting root file system... ...
[  128.172402] NET: Registered protocol family 17
...
[  130.078630] Initializing USB Mass Storage driver...
[  130.078848] scsi2 : SCSI emulation for USB Mass Storage devices
[  130.079072] usb-storage: device found at 2
[  130.079084] usb-storage: waiting for device to settle before scanning
[  130.079127] usbcore: registered new interface driver usb-storage
[  130.079182] USB Mass Storage support registered.
[  130.986043] Registering unionfs 1.4
[  130.986225] unionfs: debugging is not enabled
[  131.007607] loop: module loaded
[  131.025010] squashfs: version 3.2-UBUNTU (2007/07/26) Phillip Lougher
[  131.108132] end_request: I/O error, dev fd0, sector 0
[  131.132095] end_request: I/O error, dev fd0, sector 0
[  131.675341] end_request: I/O error, dev fd0, sector 0
[  131.699308] end_request: I/O error, dev fd0, sector 0
[  131.966937] end_request: I/O error, dev fd0, sector 0
[  132.226576] end_request: I/O error, dev fd0, sector 0
[  132.250543] end_request: I/O error, dev fd0, sector 0
[  132.673956] end_request: I/O error, dev fd0, sector 0
[  132.817757] end_request: I/O error, dev fd0, sector 0
[  132.837729] end_request: I/O error, dev fd0, sector 0
[  135.075607] usb-storage: device scan complete
[  135.142898] scsi 2:0:0:0: Direct-Access     CORNICE  Inc. Storage Ele 0811 
PQ: 0 ANSI: 0
[  135.275028] scsi 2:0:0:0: Attached scsi generic sg1 type 0
[  135.362370] sd 2:0:0:0: [sda] 7999488 512-byte hardware sectors (4096 MB)
[  135.406512] sd 2:0:0:0: [sda] Test WP failed, assume Write Enabled
[  135.406701] sd 2:0:0:0: [sda] Assuming drive cache: write through
[  135.438181] sd 2:0:0:0: [sda] 7999488 512-byte hardware sectors (4096 MB)
[  135.474158] sd 2:0:0:0: [sda] Test WP failed, assume Write Enabled
[  135.474332] sd 2:0:0:0: [sda] Assuming drive cache: write through
[  135.474569]  sda: sda1
[  138.495097] sd 2:0:0:0: [sda] Attached SCSI disk

/var/log/casper.log:
Begin: Trying netboot from 192.168.1.12:/nfsroot/ubuntu-7.10-livecd ...
Begin: Trying nfsmount -o nolock -o ro  192.168.1.12:/nfsroot/ubuntu-7.10-livecd
 /cdrom ...
Done.
/init: /init: 1: cannot open /dev/fd0: No such device or address
Warning: Unable to find the persistent medium

** Affects: casper (Ubuntu)
     Importance: Undecided
         Status: New

-- 
Casper doesn't wait for USB hard disks to come up
https://bugs.launchpad.net/bugs/158976
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