Questions tagged [optical-media]

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Linux Mint - QEMU/KVM USB Redirect and Windows 10 Guest

A couple of months ago I installed Windows 10 version 1909 in a Linux Mint 19.1 (Tessa) QEMU/KVM guest. Using USB Redirect (aka USB Redirection, virsh attach), a USB to SATA bridge is connected to a ...
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1answer
547 views

Cannot change UDP fragmentation offload

I have a Dell PowerEdge r740. I have installed RHEL 8 on it. I am trying to enable UDP fragmentation offload like this: $sudo ethtool --offload eno1 ufo on I get this message: Cannot change UDP ...
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2answers
1k views

Check if CD or DVD is blank

I cannot mount a DVD, most probably because it is blank, so it contains no filesystem. Is there a way to be sure that the disk is blank?
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1answer
65 views

Unreadable block in multiblock reading on dd / ddrescue: How does it handle it?

Let's say that I set the block size of dd or ddrescue to 256K. A sector of flash drives usually has 512 bytes, a sector on optical data discs has 2048 bytes. Let's assume that in the next 256 KB, ...
2
votes
2answers
580 views

Linux scripting - how do I wait for CD/DVD medium to load before reading/mounting?

I'm putting together a quick-and-dirty script to read 100s of CD/DVDs onto a NAS. It takes care of ejecting and loading the tray, but I haven't figured out a simple way to wait/block for the medium to ...
2
votes
1answer
388 views

Viewing ISO9660/Joliet/UDF Windows attributes?

How can I see the Windows attributes on optical discs? Examples: * Hidden. * Read-Only. * System file. The ACL tools on Linux still do not display the hidden attribute for instance.
1
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0answers
24 views

Why does accessing sr0 close the tray but return an error while the drive selects CD/DVD/Blu-Ray?

I've seen this behavior across distros (probably across operating systems, too) and across optical-media drive makes/models. It appears any CD, DVD, and/or Blu-Ray drive, if an attempt is made to ...
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0answers
36 views

How to view pending SCSI requests?

If the PC sends a request to read a sector on an optical disc, which turns out to be unreadable, the drive deadlocks the program into responselessness and motionlessness, until it returns the sector ...
1
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0answers
45 views

How can I figure out why my laptop optical drive no longer reads CDs/DVDs?

Summary My laptop's optical drive stopped reading discs a while ago, but I'm never given an error; I want to figure out what exactly is wrong with my optical drive. Background This is a Toshiba ...
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0answers
31 views

How can I find out if a read error on a optical disk is due to corrupted file system or physical damage?

I have a video DVD that I'm trying to extract but that is very hard to read (takes several days and not finished). Is there any way to find out if the problem is a physical damage of the surface of ...
1
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3answers
239 views

What is happening when I read a corrupt optical media with dd and it's really slow?

I have a DVD that I can't rip or copy using regular commands. If I try to copy it it will first copy at normal speed, but then slow down and take a very long while to do seemingly nothing. Right now ...