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Flash drives are Readable and Writable. If I mark all files in them as Read-Only the user can delete all files without seeing no warning.

How to mark the whole drive as Read-Only?

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If the drive is NTFS formatted, you open the properties window in the files in question, head to the Security tab, and disable write permissions for users other than yourself.

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This solution will also work with Mac OS X as Macs can read NTFS partitions but can't write to them. – MHrappstead Nov 11 '10 at 18:42
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But linux users won't respect such restrictions, right? – Vam'çá Nov 11 '10 at 18:43
@user53850 I'm not entirely sure. I believe you can change the permissions under Linux, but I will have to check. – Paul Lammertsma Nov 12 '10 at 2:35
I promised to follow up, so I checked renaming a file within a password-protected Windows user profile under Ubuntu 10.10. Sure enough, Linux has no problems modifying it. I suppose there's not a cross-platform fix. Perhaps you should consider using a optical medium or placing the files within a TrueCrypt volume where write-access is password protected (though this requires software to be installed for each client). – Paul Lammertsma Nov 15 '10 at 10:22
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up vote 1 down vote

There is a way of disabling write access for all drives connected to the current Windows instance:

  1. Go to Start -> Run -> Type regedit and hit Enter or click on the OK button. Browse to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control

  2. Create a new key called StorageDevicePolicies Right click on the Control, select New -> Key and type in StorageDevicePolicies

  3. Create a DWORD called WriteProtect under StorageDevicePolicies that you created in step 2 and set the value to 1.

http://www.raymond.cc/blog/archives/2006/05/07/disable-write-access-to-removable-storage-devices/

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Take note that this only works on the machine the USB drive is plugged into. – Paul Lammertsma Nov 12 '10 at 2:36
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