Program reads data faster than it can write to disk

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Back_up_AZ
Posts: 22
Joined: Mon Feb 17, 2025 12:36 am

Program reads data faster than it can write to disk

Post by Back_up_AZ »

hello

i say this message a couple of times today and i was like ????? the system i use is a monster 20 core unit latest everything 128gb ram and i get this message ?

i looked at the board and found several old old messages last one was from 2020 prior was before 2011 im using a LG blu ray m disc patched and no issue since patching over as year ago. it works great even when i cannot use my old faithful win 10 machine i9 built crazy also most discs I'm ripping are aacs 81 also these r blu rays I'm ripping that gives me this message, any ideas or ??? also when is next update beyond 81
Woodstock
Posts: 10705
Joined: Sun Jul 24, 2011 11:21 pm

Re: Program reads data faster than it can write to disk

Post by Woodstock »

Disk writing speed is most important here. If you can read disks quickly, you have to be able to store what's read just as quickly... and a lot of times, your disk write speed isn't as fast as you're thinking it is.

I typically would write to an 8-drive array, feeding it with 2 or 3 disks. When I would get that message, I would have to check my network cables, because it usually indicated that one was failing.

I would see it more often when I was writing to a local disk, WHILE doing other things. The network provided buffering that local wasn't. MakeMKV has surprisingly little overhead, but it can push your hardware. I ran tests with a Wintel miniature computer a few years ago; it could only manage a 10mb/s connection to the server, although it never actually reached that speed when writing. It had a small local disk, but not enough to hold a DVD or BD worth of data, so it was limited to network... and always posted that message.

That experiment ended when I got sick of having it NOT report that it had finished reading a disk until it finished writing it to storage, which sometimes took several minutes as the cache was emptied out. Gigabit networking and wide-bandwidth servers for the win!
dcoke22
Posts: 4186
Joined: Wed Jul 22, 2020 11:25 pm

Re: Program reads data faster than it can write to disk

Post by dcoke22 »

I make decrypted backups of discs first and then create .mkv files from the backup. I see that message every single time when creating .mkv files. Granted, it is usually writing files at 400MB/s when I see those messages, but I see them. They're informational and in my case speak more to the limits of my local USB bus and the SSD hanging off it. In other cases, as Woodstock mentioned, they might indicate the network or NAS is busy or that a cable is failing. Or it might be that your machine is busy doing something else, installing an update of some kind maybe.

Unless something else is wrong on your computer, it probably doesn't really matter.
Back_up_AZ
Posts: 22
Joined: Mon Feb 17, 2025 12:36 am

Re: Program reads data faster than it can write to disk

Post by Back_up_AZ »

ssd 2tb 6gbps drive makemkv is writing to never saw it before, but i was reading 22mbps on the drive 7.3 speed to a ssd onboard not on same drive as system
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