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I wanted to clone a 256M SD card on a 8G SD card.
This is what I have done to achieve this:
I made a partition backup of the 256M SD card with AOMEI Backuper
I restored the 256M partition to the 8G SD card with AOMEI Backuper, but I was not able to resize the partition, and I thought I can do this later
The restore was done just fine, but form the 8G SD card I only can see a 256M partition.
I have used disk management tool from win7, diskpart, miniTool, SD Formater, but my 8G SD card can only use the 256M partition.
How can I have back the full 8G of my SD card ?
Thanks,
Radu
When you clone an storage device, what you get is exactly that, a clon from the first one. Now you have the same partition table than the 256MB sd, and the 8GB sd now thinks that you have only 256MB, not 8GB.
What you can do is use testdisk to restore the first sectors of the partition table.
Other solution is that you save the files, and make a full format of the sd, or make a clon from other 8GB sd in that.
I put this card into an old Samsung smartphone i5700.
It told me that the card is damaged and I have to format it. So I did.
After that the original storage size of the SD card was restored.
Great, I've learned something today!
Regards to all of you,
Radu
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My 64gb SD card won't show up in my Jetson Nano. I would also to use it as a default storage. How do I do it without reinstalling anything like the Jetson Pack (OS) which is already in the Jetson nano?
I tried flashing the SD card but I found out that I don't need to do it since the flashing means installing an OS to Jetson but it's already there. the problem is it doesn't show up in my list of devices as I insert the SD card.
Jetson's boot process involves many stages that can be implemented in various ways depending on your hardware.
My understanding is that reComputer would be hw similar to nvidia devkits.
If using a Nano/Xavier devkit + SD card (as opposed to eMMC production modules), some of these early boot stages may involve QSPI memory.
This would imply same version as later boot stages on SD Card.
You would try reflashing the whole devkit+SD card with same JetPack version from host running latest SDKM.
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I tried to install RASPBIAN os using noobs in to my pi. But when I start the pi after coping the noobs into my sd card, it shows the folling error.
Error resizing existing FAT partition
How to fix it, Thanks in advance.
This usually happens when raspberry cannot read the SD data, and you can fix it by doing a lot of things, for example:
Change the SD card, format the new one of FAT32 and put all of Raspbian data inside it
Get your current SD card and format it again, try to check if this is ok to read/write
Go to this link and check if your SD card compatibility
Check if your power supply is really 5V, and if its passing to Rasp, sometimes rasp doesn't work well because it hasn't enough power
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I just want to know, whether I can transfer my pi projects to other pis by simply plugging the sd card into a different pi without damaging any of the projects on them.
There is no data stored on a Raspberry Pi except on the SD card. You may move your card from one Pi to another.
Well, there is data stored in the RAM, but that's no big deal. Just make sure your raspberry pi is off, to avoid corrupting your SD Card (that's happened to me several times). But other than that, it should be just fine switching out SD Cards to another pi.
Just to be safe, I would recommend using the same Raspberry Pi model (although it probably doesn't matter)
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Is it better to order VPS with SSD drive or more RAM? SSD is quite expensive so far and MongoDB requires a lot of disk space. My current database size is ~50 GB, so would performance be better on SSD with 1 GB RAM or HDD with 8 GB RAM?
I'd start with estimating what you think the working set of memory used by MongoDB size will be - some details on how to approach that estimate can be found here:
http://docs.mongodb.org/manual/faq/diagnostics/
It's a function of the set of data that your application routinely accesses plus the amount of the indexes that need to be kept in memory. If you don't have enough memory to do that my experience has been that performance drops off of a cliff fairly quickly. I think SSDs are great for database performance all around but again my experience has been that you're better off making certain your working set remains in memory.
In my opinion 1GB for a production system is rather low - this needs to handle the OS, mongod and other daemons, the working set, plus anything else you need to do on the server. And keep in mind that if your database is growing your working set size is likely growing too, if for no other reason than indexes getting larger.
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Why is an operating system software
loaded from hard disk than from a rom
chip?
I was asked this question and I am unable to find the answer.
Can someone explain?
The easiest answer is ease of patching and extensibility. ROM cannot easily be patched - though with some permanent storage location and some creativity and foresight when building your initial ROM, you can patch it with some hook code.
Size of ROM isn't a great answer. CD/DVDs are a permanent location and could be used, though not ROM 'chips'. ROM chips can be made large enough to handle an OS (heck some versions of Linux fit on floppies not too long ago) and wouldn't be that expensive, though worse than a DVD for distribution costs.
Replacing an OS via a new ROM chip isn't that attractive, but if you just plugged in a new PCI card, would that be so bad? We do that already so this isn't a great argument either.
Access speed to a ROM chip, generally, will be much superior than to a harddrive so you would get a performance boost this way, so that's actually a plus. Also having a ROM makes it that much harder for malware to infect the OS - another plus.
So, in general, I see many pluses for a ROM based OS vs a RAM based one. Nice question.
An OS on a harddisk can be replaced by installing a new one onto that disk, and it can be easily updated.
If your OS is burnt into a ROM, that won't really work. Replace the OS?? Rip out the ROM chip and stick in a new one.... not a very attractive suggestion! (at least not for a desktop PC or notebook)
I guess iOS/Android is not loaded from a hard disk, so that depends.
Size and demand. Flash chips large enough to hold an OS that most people want/would want to run are ridiculously expensive.