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250G USB disk can not be mounted at boot time.

Minoru Asano
Frequent Advisor

250G USB disk can not be mounted at boot time.

Hello,

The customer would like to mount USB disk automatically.

[ENVIRONMENT]
RHWS 4 up5, kernel 2.6.9-55ELsmp , XW4400WC

[SITUATION]
USB disk is not mounted at boot up time.
But after start up, USB disk can be detected if he plug off and plug on the USB disk.
And it seems that Fedora core Linux can be detected USB disk at boot up time.
The USB disk is 250G bytes.

[QUESTION]
- Have you ever seen this phenomenon ?
- Is there any restriction for USB disk ?
For example, Over 128G USB disk can not be detected automatically at boot up time, so on.

Thank you for support and advice.
Best Regards.
/Minoru.

2 REPLIES
Don Vanco - Linux Ninja
Regular Advisor

Re: 250G USB disk can not be mounted at boot time.

When booted with the device attached, does the OS see the hardware BEFORE you unplug/re-plug? (quick test: cat /proc/partitions)

How are you attempting the mount?
Have you tried using udev?

USB devices are flaky IMO - I've had some use what I'd normally call a "raw" device like /dev/sda, and some that are more akin to a partitioned device like /dev/sda1 - so your mount syntax could be at issue.
TY 007
Honored Contributor

Re: 250G USB disk can not be mounted at boot time.

Hello,

IDE normally take precedence SCSI

Possible defects, during OS Boot-Up Process, the USB Disk is detected as IDE Disk rather than SCSI Disk.

Workaround:
Perform fdisk on the USB Disk into 2 or more Partitions, for example 125GB/125B etc

Thanks