## dg.differential geometry – The volume of boundary layer

Let $$Omegasubsetmathbb{R}^3$$ be an open bounded set with $$C^2$$ boundary $$partialOmega$$. Let $$operatorname{d}(x):=inf_{yinpartialOmega}|x-y|$$ for $$xinoverline{Omega}$$, and the open set $$Omega_h:={xinOmega;operatorname{d}(x). Are there estimates about the volume of $$Omega_hsetminusOmega_{h/2}$$?

## Opening Chrome on macOS stops volume shortcuts from working

I’m having an issue on macOS Catalina (10.15.7) where as soon as I open Chrome (Or any chromium-based browser for that matter that I’ve tested including Brave, Edge, Opera), the volume up and volume down shortcuts completely stop working. The only way I can stop this from happening is if I completely restart my computer, only then will the FN + F10 and FN + F11 keys execute their intended action of changing the volume on my machine, only to return to an unresponsive state once I open up my Chrome browser. This does not happen on non-chromium based browsers. I’ve also tried disabling the #hardware-media-key-handling flag with no avail.

## amazon web services – How to see updates to EBS volume when attached to multiple instances?

You’ll need a filesystem / app that’s multi-attach aware. For example Oracle RAC can use such volumes, while normal filesystems like `ext4` or `xfs` can’t. They are designed to be mounted on a single host only.

Let’s step back – what are you trying to achieve? Share files between the instances I suppose? Your best bet is EFS (Elastic File System) – an AWS cloud-native NFS service. Unless you’ve got a very specific need for multi-attach EBS and running some very special app that can make use of that I suggest you explore the EFS way instead. The need for multi-attach disks is rare, both in the cloud and outside.

Hope that helps 🙂

## How many kinds of volume are there on the iPhone?

And how can I change them?

I believe the following all have independent volume levels, although there could be some overlap.

• Ringer and Alerts (as defined in Settings
• Alarm clock
• Phone calls (separate for earpiece and speaker?)
• Media (and apps in general?)
• Siri
• External devices (e.g. earbuds or Bluetooth)

Is there somewhere I can set them all, or is there at least a definitive list?

## linux – Independent pulseaudio virtual output volume

Is there a way to separate the volume for a PulseAudio virtual output device from the main output device? I would like to record something on the virtual device without hearing it play. If I turn down the volume on the virtual output the main volume silences as well.

I am using Mint Linux 20.04. Everything is working fine, just not sure if this is even possible. For completeness, I created the virtual device with the command below.

``````pactl load-module module-virtual-sink sink_name=record
``````

Again, the device is there. I can play to it and correctly record from it. The output volume (not the record volume) is linked to the default volume. I am hoping there is a way to unlink them so I can record without having to hear it. Thanks for any suggestions.

## file encryption – I lost 1GB of storage in C drive after deleting a veracrypt volume. How can i recover this lost disk space?

So I created a veracrypt file hosted volume/container and had a hidden volume inside to try it out(totalling 1GB). After a day or two, I permanently deleted the container file (after dismounting it) but i lost the equivalent amount of space from C drive. Is there way to recover this and how to prevent this in a future use of veracrypt volumes?

## BTC Daily Trade Volume Record Broke

According to data released by CoinMarketCap, Bitcoin reached its all-time high of \$ 99.3 billion in transaction volume today. This is a historical record. It is also an indication of how popular bitcoin is. How do you interpret the transaction volume record?

## macbook pro – How to lower app notification volume

I have a new MacBook Pro running Big Sur. The sound effect for individual app notifications, such as Chrome or Slack, is much louder than other sounds on my machine and I would like a way to lower their volume without changing the system volume.

I have gone to System Preferences > Sound > Sound Effects and lowered Alert volume but it has no effect on these sounds. For example, if I move the ‘Alert volume’ slider all the way to the left to where I hear no sound at all from that panel, but leave the system volume around the middle, the notification sounds I get from, apps like Slack are still extremely loud. Any help would be much appreciated.

## ssd – Is it possible to manually TRIM the free space for an existing APFS volume?

When migrating a MacBook from HDD to SSD, I did a block-level copy using `dd`. Because the SSD already contained a different OS image from a previous test, I believe for optimal performance, it would be the best to issue a TRIM for every unused block in the new filesystem to inform the SSD controller. Is it possible to TRIM the free space manually for an AFPS volume on macOS (like FreeBSD’s `trim` or Linux’s `fstrim`)?

I’ve read that macOS’s `fsck` has a TRIM pass, so TRIM can be triggered manually by running `fsck -fy` in single-user mode. But I didn’t see any message about TRIM when I tried it, so I guess it’s only applicable to HFS+ filesystems.