Problem: 4 usb drives connected to dell 2850, drives 1 thru 3 mount, 4th on does not. Fails with error "mount: No medium found"

OS: RH ES 3

--/etc/fstab entries--
/dev/cdrom1 /mnt/cdrom1 udf,iso9660 noauto,owner,kudzu,ro 0 0
/dev/cdrom2 /mnt/cdrom2 udf,iso9660 noauto,owner,kudzu,ro 0 0
/dev/cdrom3 /mnt/cdrom3 udf,iso9660 noauto,owner,kudzu,ro 0 0
/dev/cdrom4 /mnt/cdrom4 udf,iso9660 noauto,owner,kudzu,ro 0 0

The dmesg shows from when I plug the hub in. It detects all 4 cdroms, but when I try to mount /mnt/cdrom4 I get the "cdrom: open failed". I then mount the other 3 cdroms with no problem.

--dmesg output--
hub.c: new USB device 00:1d.2-2, assigned address 7
hub.c: USB hub found
hub.c: 4 ports detected
hub.c: new USB device 00:1d.2-2.1, assigned address 8
WARNING: USB Mass Storage data integrity not assured
USB Mass Storage device found at 8
hub.c: new USB device 00:1d.2-2.2, assigned address 9
WARNING: USB Mass Storage data integrity not assured
USB Mass Storage device found at 9
hub.c: new USB device 00:1d.2-2.3, assigned address 10
WARNING: USB Mass Storage data integrity not assured
USB Mass Storage device found at 10
hub.c: new USB device 00:1d.2-2.4, assigned address 11
WARNING: USB Mass Storage data integrity not assured
USB Mass Storage device found at 11
udf: registering filesystem
cdrom: open failed.
cdrom: open failed.
UDF-fs DEBUG lowlevel.c:57:udf_get_last_session: XA disk: no, vol_desc_start=0
UDF-fs DEBUG super.c:1421:udf_read_super: Multi-session=0
UDF-fs DEBUG super.c:410:udf_vrs: Starting at sector 16 (2048 byte sectors)
UDF-fs DEBUG super.c:437:udf_vrs: ISO9660 Primary Volume Descriptor found
UDF-fs DEBUG super.c:440:udf_vrs: ISO9660 Supplementary Volume Descriptor found
UDF-fs DEBUG super.c:446:udf_vrs: ISO9660 Volume Descriptor Set Terminator found
UDF-fs DEBUG super.c:1430:udf_read_super: UDF-fs: No VRS found
ISO 9660 Extensions: Microsoft Joliet Level 3
ISO 9660 Extensions: RRIP_1991A
UDF-fs DEBUG lowlevel.c:57:udf_get_last_session: XA disk: no, vol_desc_start=0
UDF-fs DEBUG super.c:1421:udf_read_super: Multi-session=0
UDF-fs DEBUG super.c:410:udf_vrs: Starting at sector 16 (2048 byte sectors)
UDF-fs DEBUG super.c:437:udf_vrs: ISO9660 Primary Volume Descriptor found
UDF-fs DEBUG super.c:440:udf_vrs: ISO9660 Supplementary Volume Descriptor found
UDF-fs DEBUG super.c:446:udf_vrs: ISO9660 Volume Descriptor Set Terminator found
UDF-fs DEBUG super.c:1430:udf_read_super: UDF-fs: No VRS found
ISO 9660 Extensions: Microsoft Joliet Level 3
ISO 9660 Extensions: RRIP_1991A
UDF-fs DEBUG lowlevel.c:57:udf_get_last_session: XA disk: no, vol_desc_start=0
UDF-fs DEBUG super.c:1421:udf_read_super: Multi-session=0
UDF-fs DEBUG super.c:410:udf_vrs: Starting at sector 16 (2048 byte sectors)
UDF-fs DEBUG super.c:437:udf_vrs: ISO9660 Primary Volume Descriptor found
UDF-fs DEBUG super.c:440:udf_vrs: ISO9660 Supplementary Volume Descriptor found
UDF-fs DEBUG super.c:446:udf_vrs: ISO9660 Volume Descriptor Set Terminator found
UDF-fs DEBUG super.c:1430:udf_read_super: UDF-fs: No VRS found
ISO 9660 Extensions: Microsoft Joliet Level 3
ISO 9660 Extensions: RRIP_1991A

To be honest - I don't know if you can connect that many mass storage nodes to one USB hub.....
What I mean to say is - you are connected not to a standard USB hub - but the hub that controls all the ports in your machine. i don't know if that hub can handle it - furthermore - I'm not sure that the usbstorage module can either....