hard drive – Macbook on OSX Catalina 10.15.7 not returning disk space after deletion

this started first of all when I was trying to get rid of purgeable space by creating lots of files using the dd if=blah blah of=/users/user/bigfiles/bigfile1 etc etc. When I deleted these files I didn’t get my disk space back. Even now deleting large video files has no effect.
I have tried all the usual tricks “First Aid” (in recovery mode) and all the disk checks I know how to do, booted into single user mode etc, and run utilities like ONYX, but even though it didn’t fix my disk it seemed to find something wrong. Can anyone please shed some light of the results?

Also some people have suggested this is a local Time machine backup issue so I deleted all my local backups and verified there are none there.

As you can see I have some errors when I scan disk Macintosh HD – Data, I get a bunch of

warning: xf: INO_EXT_TYPE_DSTREAM: found unexpected stream associated with non-regular file
and then
Too many warnings crap; suppressing subsequent ones

then a load of

warning; FOUND ORPHAN DSTREAM IDOBJECT (id 384942334 (or whatever) refcnt 1)
Too many warnings crap; suppressing subsequent ones

The volume /dev/rdisk2s1 appears to be ok

As you can then see from the next screen shot 478GB used and 600MB free

Rebooting into multi user mode I looked at the local snapshots.

I had already deleted all my local snapshots and can show there are none left with:

….and get nothing listed…

Next I run Daisydisk and you can see 0.5GB free so I scan the disk and see that:
498GB total used but if you add the items shown you only get approx 260GB so apparently 240GB has been eaten by the system and hidden somewhere.

Any ideas?

Regards
P.S. so I couldn’t work out how to insert multiple files (screen shots and a PDF) so here is a link to a Onedrive directory with them in it.

https://silverfoxpc-my.sharepoint.com/:f:/p/royswift/EoMj7wW0uwtJroUuQWXTfMMBYQVlkbmmRhUsJacEvc4nIw?e=bQ5DJF

hard drive – Free space shown on Windows 10 (BOOTCAMP partition) does not correspond to the free space shown on Disk Utility

I’m not quite sure how this works, but yesterday I used Boot Camp Assistant to get Windows on my Mac. Somehow the space available on the C drive is 10 GB whilst in the Disk Utility it shows 18 GB of free space on it.

I checked with the space analyser in the wizard tool partition to see where all the space went to (I have partitioned 30 GB for the BOOTCAMP partition and haven’t done anything on Windows, yet I only have 10 GB left already), it does show that there is only 10 GB of free space, but I’m confused as to why Disk Utility is showing different data.

I’m a little anxious about this because my Mac has low storage space to begin with so I’m worried that I installed Windows and can’t use it.

Also, if anyone knows about methods to free up some space would be great help.

difficulty – I need help on how to change the disk to run my bitcoin core wallet

Long time ago I transferred my wallet on My Passport an external hard disk. I have not opened bitcoin core for over 8 months. I opened it 2 days ago, the dialog box opened, which normally doesn’t and I was asked to choose where to open bitcoin core. I chose the external disk.Something went wrong. Finally I understood that there was a problem with the disk and it was not mounting on my macbook pro. I fixed that problem. However bitcoin core continues to open at the default file on my mac which is empty. My wallet shows no transactions and it is updating since 11 years back.
I need to be able to open the dialog box at start of bitcoin core to choose again the correct disk but I don’t know how to do that. My knowledge is very limited

disk utility – Sandisk Ultra 3.0 128GB USB can’t be detected on my Mac or Windows 10 after removing it

I bought a Sandisk Ultra 3.0 128GB USB for my Mac, a few years ago, so I could move files to windows if I wanted. All was well and working fine until I accidentally unplugged the USB from my Mac while transferring a file to it. Now my Mac is no longer able to detect the USB, and my Windows 10 desktop can see it but can no longer read it. It shows up but is is showing that it has 0 gigs

Here are some facts:

• The USB doesn’t show up on Mac in system information, disk utility, recovery mode, or when I put in the command I found to show the active drives in Terminal… It seems to have become completely invisible. (I’ve made sure that Finder isn’t hiding it)

• On my Mac I’ve tried restarting / shutting off the machine, as well as resetting the VRAM and the SMC.

• My Mac can still detect other USB storage devices when I plug those in.

It’s a MacBook Pro (Retina, 15-inch, Early 2015) running OS X Yosemite.
Any tech genius out there with a solution or some sort of idea / suggestion?

Any idea would be appreciated. It seems the USB is no longer working, I just have no idea how to get the two machines to detect it so I can repair it or so I can get the files off it.

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difficulty – I need to choose the right disk to run my bicoin core wallet

Long time ago I transferred my wallet on My Passport an external hard disk. I have not opened bitcoin core for over 8 months. I opened it 2 days ago, the dialog box opened, which normally doesn’t and I was asked to choose where to open bitcoin core. I chose the external disk.Something went wrong. Finally I understood that there was a problem with the disk and was not mounting on my macbook pro. I fixed that problem. However bitcoin core continues to open at the default file on my mac which is empty. My wallet shows no transactions and it is updating since 11 years back.
I need to be able to open the dialog box at start of bitcoin core to choose again the correct disk but I don’t know how to do that. My knowledge is very limited

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I’m using Postgres on AWS EBS, when running a query that uses a bitmap heap scan and a bitmap index scan, the execution time seems proportional to the number of “heap blocks” read, as shown by the EXPLAIN ANALYZE (I’ve not 100% verified this). Because EBS is networked attached storage, it has a high (~1ms) latency, but a high throughput/bandwidth, meaning Postgres wouldn’t be taking full advantage of the disk.

Is it the case that when reading from Disk postgres queries blocks/pages sequentially?

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hard drive – Clone img file to hdd in dos/freedos (whole disk including mbr/parttable)

I have a bootable freedos usb stick. On this bootable usb stick I have a 450MB harddrive image file. The image file are created with the “dd” command on a whole harddrive- so its a raw hdd-image including the partition table/MBR.

I need to write this image to a physical harddrive inside the pc I’m booting with the freedos-usb stick.

I found the dos software rawrite, but it only works on formated drives, so it seems it only works on partitions, not disks.

In Linux or Mac what I would like to do would very simply be acomplished with “dd if=imagefile.img of=/dev/mydisk”, but I have to do this from within freedos.

Gnu dd for dos actually says this in its help: “Files can also be ‘0:’, ‘1:’ etc. to access disk drives (be careful!)” But I have tried this and “of=1:” (or if=1: ) is not a valid file for dd.

Any suggestions for tools I can use to acomplish this in dos? (Not windows!

(I think this is a software question yes – however, my post was removed from stackoverflow since they think its a hardware question. I was refered to superuser)