Questions tagged [data-storage]

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FPV interfacing with Arduino boards

I have been trying to interface a Run Cam Nano 3 with Arduino Nano to read the video data. There are 3 pins to the camera, a 5V pin, a GND pin and a video pin. I have been trying to analogRead from ...
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1 answer
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Solid state data?

I'm wondering if there is a way to store a small integer in a way that if you turn the microcontroller (an atmega328, in my case) off, and then turn it back on again, the variable won't reset. Do I ...
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1 vote
1 answer
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How to kill a NVME M.2 SSD?

I have an SSD that has completely failed within a week of purchase, unfortunately I have my personal and business info on there. I need to send the drive back for a replacement, however I also need to ...
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How to store bits asynchronously without clock resetting all bits?

I am working on a circuit that has 8 buttons that need to hold the value once pressed. I'm currently using a 8 bit flip flop (74LS273 in the diagram). The problem is that all bits get reset on the ...
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Shared storage between microcontroller and Embedded Linux system

I'm working on a project in which I have to solve this problem. I'm not sure if it's unique, but it's certainly not one I've seen before so I thought it'd be interested to get some input from people ...
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Swapping the SSD controller without data loss possible?

Does swapping the controller chip within some ssd always imply data loss, or is it possible that for some SSDs all the relevant information (like translation layer parameters) is stored on the NAND ...
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Logging GYRO Data via cheap modules or Black Box

I'm trying to figure out a simple solution to log gyro data to use with camera stabilization software. I know I can use the blackbox from an old flight controller with an external SD card logger, ...
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2 votes
1 answer
70 views

Mass storage for timing critical applications

I am working on a data logger that requires measurements to be taken during narrow time windows. I have been storing the measurement data on SD cards, however, the write times are very inconsistent, ...
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Would it be possible to use a GSM without a SIM card?

I would like to reduce the footprint of my PCB (a simple IOT GSM impl.). Given a common GSM such as SIM800/868/900l etc. Would it be possible to completely replace the footprint of a SIM card holder (...
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Compatibility of embedded device with USB drives

It seems to be a frequent problem with embedded MCUs and USB drives having compatibility issues. Some type of drives from certain vendors work, others do not. Is there a trick to getting high ...
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1 answer
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Power outage detection to kickstart a safe shutdown and data retention process

I plan a system that operates on a 5v rail. The power is supplied from an outside DC source. The 5 V powers an RPI CM4 and other components that are controlled by it. The whole system requires up to 5 ...
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3 answers
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Is a computer wired controlled sd card or USB flash drive feasible (like the Scylla cards connected with a laptop in prison break)?

Is a computer wired controlled sd card or USB flash drive feasible (like the Scylla cards connected with a laptop in prison break)? It means there is no storage on the flash drive itself. When a ...
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3 answers
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Old tvs, how did storing settings work, and what changed in the tv when we tuned a channel?

I don't have an EE background, but I would like to understand some aspects of old TVs. When we tuned channel what exactly changed inside the tv. Was there a circuit card in the tv where something ...
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23 votes
7 answers
9k views

How can I actively provoke data rot on a storage unit?

For a project, I am looking to deliberately provoke data rot on a storage unit (e.g., a hard drive or a flash drive). I understand that most modern OSes and filesystems as well as hardware have ...
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How can I let 2 devices take turns accessing a SIM card?

I need to store data in a sim card using one device, then another device needs to access that data. They do not ever need to use it at the same time. A question was asked about this a few years ago ...
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3 answers
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Storing data for a really really long time [closed]

How might one store data for the far future? (100 years and up, possibly centuries) This is entirely hypothetical but would it be possible for semiconductor based data storage to have similar ...
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1 answer
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Calculating data retention rate of SLC NAND

Background I am a software developer trying to calculate data retention rate of a NAND memory ic. I have minimal knowledge/experience with electronics. I have a constraint on data retention, 15 years. ...
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3 answers
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How to store one bit without the use of an IC? [duplicate]

I am trying to store a bit of data from a circuit, but I don't want to use an IC like an EEPROM chip. Is it possible to store one bit with a transistor or something else to that effect?
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How do modern displays output data to pixels? [closed]

Do new displays still write pixels one at a time? I thought this was the case until I saw a video showing slo-mo footage of a display, in which it was clear that all of the pixels are on at the same ...
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User controlled storage devices existence

Today's memory devices have a lot of logic embedded before data is actually written onto the NAND pages. An example could be wear levelling algorithm , FTL functionalities etc. The typical life of a ...
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2 answers
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data storage, FPGA to mass storage device

For a project I am working on I need to transfer, without loss of information, continous data bursts at a maximum of 48 MB/s from an FPGA to a mass storage device. An SD card device (with appropriate ...
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2 answers
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Is only a firmware limitation the fact that some camera can't store photo in RAW format? [closed]

I was interested in understanding if from the point of electrical engineering storing the RAW data of the sensor directly into the memory of the camera require special hardware. Could be more ...
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4 answers
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How did old games from 8-bit era game consoles store music? [closed]

Some time ago I found that the audio of a game called Ninja Gaiden 1 (NES) is around 1 hour. This is excluding the sound effects like jump and hit e.t.c. Then I found that the entire game size is ...
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2 votes
2 answers
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I've seen many conflicting answers online: For optical storage, does a pit represent a '1' bit or does a land represent a '1' bit?

I've seen many conflicting answers online so: When reading an optical disk, which one of these is true: A 'pit' represents 1 and a 'land' represents 0 or A 'pit' represents 0 and a 'land' ...
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How to convert raw radar sensor data into custom compressed data format for efficiently storing and archiving on file system

The binary raw data from the SAR sensor is processed in fpga and outputted as hex. Now, this data we currently store as ASCII in .txt files. However, it takes lots of space in storing. Is there an ...
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Flash storage: How do I know the remaining writing cycles without relying on SMART?

Flash storage such as SSD has a SMART system like HDDs. But USB sticks and SD cards lack that. Optical storage has error/quality scanning that can predict failures early, while error correction is ...
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6 votes
2 answers
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Flash storage: Limited read cycles?

Comment from http://electronics.stackexchange.com/questions/356185/nand-flash-retention-using-usb-charger/356190?noredirect=1#comment855287_356190 claims that reading from flash storage is no lossless ...
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4 votes
2 answers
313 views

How does a CD or DVD burner produce submicron lines separated by submicron distances?

What mechanism(s) are used to achieve repeatable submicron spacing between concentric tracks in a DVD, CD, or other optical writer? I want to understand the minimal set of hardware used to achieve ...
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1 vote
1 answer
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Is it possible to read the memory from a Holtek HT46R064B OTP(!) chip?

I am trying to get data from a Holtek HT46R064B. I know that the Chip is an OTP (One-Time Programmable) Chip. I ask myself if it is possible to read some parts of its memory. In my case the chip is ...
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Is it possible to design a SD 3.0 controller in UHS-ii/uhs-i mode using simplified specifications?

I've been for while looking at how to store sampled data up to a rate of 30MBytes/s; an SD 3.0 host controller core in uhs-ii/uhs-i mode fits the requirements. I'm not planning to buy the SD full spec ...
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6 votes
2 answers
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Fake a panasonic battery to revive camera to copy photos from internal memory

Got this camera from a friend, battery door broken, no cables, no battery. There are some important photo's on this camera that I want to copy from internal memory to SD card. We first want to try ...
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18 votes
2 answers
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Why are NOR flashes still used when NAND flashes have a bigger size?

I've seen a few systems that uses a NOR flash to boot from, and a NAND for a bigger filesystem. I've also seen a system with only NAND gets corrupted after files being written to and verified correct. ...
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1 answer
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What data is stored in an eeprom that’s not in the flash memory? [closed]

I’m wondering generally what information is stored in an eeprom that’s different than what’s in the flash drive that contains firmware? Mostly in mobile devices. Does the eeprom contain user settings ...
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2 answers
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CPU-Multiplier Overclocking causing (silent) data corruption?

There have been a large number of threads regarding CPU overclocking and damage to electrical components in the past. Mostly, however, these questions were directed at how increased voltage and the ...
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1 answer
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Is there any kind of backup for the data that is deleted during NAND flash block erase? [closed]

In NAND Flash, the whole block is erased.How is the data in that block that is not intended to be erased, gets recovered after it is erased? Is there some kind of Flash Memory Management Unit that ...
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2 answers
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Datalogger storage calculation

How to calculate the required storage capacity of a data logger given the measurement time sampling rate and resolution? I want to log two voltages at 1Hz rate for 3 months continuously and looking ...
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3 votes
1 answer
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Save data on sim card using micro-controller

SIM cards come in various data capacities, from 8 KB to at least 256 KB. All allow a maximum of 250 contacts to be stored on the SIM, Is it possible to save data (other then contacts) in sim card, ...
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2 votes
3 answers
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Why optical disk CD/DVD use spiral tracks, as opposed to cocentric tracks used in hard disks and floppy disks?

I'm not sure this is the community in which should I ask this question, if it isn't, I'm willing to transfer it. According to this article: Track positioning also follows two different methods ...
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2 votes
2 answers
91 views

Preserving state of variables in RAM on Power Failure

I'm developing a code with Nuc240(ARM Cortex M0) Microcontroller. Where I need to store the value in some of the variables to the Internal Data Flash. I use ISP procedure for this, but i have seen the ...
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0 votes
2 answers
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physical 0 and 1 signals in communication and storage systems

How are 0 and 1 signals actually encoded in today's communication and storage systems? Would their actual encoding cost the same or differently? My intuitive guess is that there must always be some ...
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1 vote
1 answer
2k views

Using STM32 to transfer a file via bluetooth

So far I have been doing projects with Arduino, RPi, ATtiny etc. But now I have project in mind where these things doesnt seem to suit. I need your help. OK, now on the project: I have a file on my ...
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Design Question: 20 MS/s data acquisition

Let me preface that I am fairly new at working with sampling high speed signals. Specifically, I want to do some processing on slightly corrupt NTSC signals. For this, I need to sample at above 14.3 ...
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5 votes
2 answers
2k views

Refreshing flash memories. Does it work?

We all know that the flash memories have data retention time of around 10..20 years. But what if we need to design a device that has to work for 1000 years? The obvious solution is to make a flash ...
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0 votes
1 answer
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Write operations on eMMC chip (not SPI) with data incoming from MCU

I'm working on integrating an eMMC ship to a FPGA. As for now, the initialization is working fine, I've managed to receive the CSD and CID registers properly, and I can select and move the chip to ...
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10 votes
1 answer
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SPI data storage devices: (micro)SD card, DataFlash, or serial EEPROM?

I am revisiting some of my design habits, and one of them is under serious scrutiny: the go-to SPI-based storage device is (micro)SD cards, for their price-to-capacity ratio and generally higher ...
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1 answer
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Record video from webcam w/o microcontroller [closed]

I managed to salvage a webcam from a broken laptop, and I'm looking to use it to record video in a small package to attach to a rocket. However, I need to record the video to some data medium like a ...
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0 votes
1 answer
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What is the best way to store date & time in eeprom using less bit possible?

I want to save data associated to a timestamp (like a datalogger) along a month, in a very small memory (probably only 1024bytes). I was thinking using epoch time to save timestamp but it already take ...
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1 answer
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M48Z02 SRAM unexpected data loss

I'm using a M48Z02, a 5 V 16 Kbit ZEROPOWER SRAM. In absence of power, according to datasheet information, this device can hold data for years: A [...] package houses the M48Z02 silicon with a long-...
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-1 votes
3 answers
868 views

Is there an IC that can shift-in, store and shift-out serial data [closed]

I want to storing serial data from an Arduino, and make it available for a second Arduino to read. Is there an IC that can receive serial data, store it, and send it out when needed? One solution ...
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11 votes
3 answers
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How long until my eMMC is dead?

I got some feedback from our software team. Apparently we're writing twenty 4KB blocks per second. I have a 4GB eMMC. The eMMC has a max number of P/E cycle of 3000. I'm making the assumption that all ...
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