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Questions tagged [data-storage]

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2answers
73 views

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' ...
0
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1answer
73 views

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 ...
0
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0answers
41 views

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 ...
4
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2answers
776 views

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 ...
4
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2answers
187 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 ...
1
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1answer
304 views

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 ...
0
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1answer
189 views

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 to store a sampled data up to the 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 SD full spec and ...
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2answers
475 views

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 ...
18
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2answers
3k views

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. ...
0
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1answer
503 views

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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2answers
204 views

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 ...
-1
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1answer
175 views

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 ...
0
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2answers
65 views

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 ...
3
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1answer
285 views

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, ...
2
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3answers
2k views

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 ...
3
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2answers
73 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 ...
0
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2answers
82 views

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 ...
1
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1answer
1k 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 ...
0
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2answers
185 views

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 ...
4
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2answers
851 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 ...
0
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1answer
442 views

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 ...
8
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1answer
3k views

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 ...
0
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1answer
327 views

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 ...
0
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1answer
817 views

Does manufacturing different sized hard drives cost the same amount? [closed]

Is there a major difference in the cost of manufacturing, say for example, a 1 TB hard drive as compared to a 250 GB hard drive? Is it the same when hard drives get even as big as 8 TB? If no, then ...
0
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1answer
625 views

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 ...
1
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1answer
198 views

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 ...
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votes
3answers
498 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 ...
4
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2answers
11k views

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 ...
0
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2answers
157 views

Using SPI Nor Flash as storage memory in Vehical tracker device

I am designing a Vehicle Tracking device. I need a storage memory of 2Mb to 8Mb to store data from MCU. Based on what my MCU supports, I am planning to use SPI NOR Flash as a storage Device. As I know ...
1
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2answers
213 views

Mass Storage for Embedded Applications

What are my options if I need to deal with relatively large amounts of data on an embedded processor? I've found storage around ~2-4GB with an SPI controller, but I'm thinking about something in the ...
3
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1answer
235 views

Finding the maximum storage of a CD from measurements of pits and lands?

Full disclosure: This is schoolwork. I'm not asking for anyone to solve this for me, I am only asking if I'm on the right track with my thinking. I have imagery of a CD from an atomic force ...
0
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2answers
264 views

DMM Hack to Log Amps: [closed]

I have a spare DMM (Digital MultiMeter) that I would like to use to log the displayed data at 1 sample/sec. What would be the least expensive way to mod the DMM to log the data that appears on the ...
1
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0answers
73 views

Crypto key handling in a uC

What are the general guidelines for handling a cryptographic keys? I know that saving them in plaintext is generally frowned upon, does this hold for true uCs where no user code is run?
-2
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2answers
139 views

Non-volatile storage system made up of logic gates [duplicate]

So, I don't want all my data blown away every time I turn off my system, so how would I create a storage system that doesn't use batteries but also keeps the data that I have stored?
0
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1answer
56 views

Can we know the limit of the number of times information can be stored/retrieved in computer chips - hard disks and RAM?

I was wondering whether the memory storage of a single memory area in computer semiconductors is limited in terms of the number of times it can be used. I'm also wondering what will happen to the data ...
3
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1answer
876 views

How to capture values displayed on 16x2 LCD

I have an inexpensive in-line DC Wattmeter that I often use to measure yield from Solar Panels / Modules and other energy sources with reasonable accuracy and resolution. It has a 16x2 LCD display (...
3
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1answer
751 views

How to store more waveform after trigger and less before?

I have a Rigol DS1074Z and can't figure out how to lower the time the scope spends pre-sampling to open up more memory for the actual data I want to see. Here is a nice image that will hopefully ...
6
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1answer
1k views

SD card access slows down with many files

I'm working on a data logger application using a MSP430F5529 running at 2 MHz and a SD card using FatFs. The SPI interface is already running at maximum frequency. However I am seeing very erratic ...
0
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1answer
113 views

What's the best storage method? [closed]

I was wondering about what's the best storage method to save files to in order to save it from natural dynamics like earthquakes, tsunamis, or just to keep them along times... We all know that there ...
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1answer
165 views

Is it possible to store data in molecules? [closed]

Is it possible to store data in charged molecules? If so, how? If not, why not?
-1
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1answer
373 views

Easiest & cheapest way to use embedded filesystem on SD card [closed]

I want to build a cheap, basic project which logs data to an SD card that can be removed and read using a normal card reader in a computer. Requirements are fairly basic so performance is not ...
6
votes
2answers
310 views

Is there any possibility of dissecting a microchip to get data from its internal memory?

There are many devices that perform various cryptographic operations inside their microchips. One of their key feature is that the secret keys are stored inside of the hardware and never leave it. ...
2
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4answers
288 views

Data compression for large amount of binary data

In an embedded application of mine, the device generates a large amount of instrumentation data that is stored every few minutes in an NVM, such as a set of EEPROMs or a Data Flash. This data is ...
4
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2answers
799 views

Reliable secondary storage for Raspberry Pi (or other such single-board computers (SBCs))?

Most SD cards have a fairly limited life (as in maximum number of read-write cycles), and in spite of wear-levelling, for relatively frequent disk update applications, would probably fail in a year or ...
1
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3answers
826 views

Why are some mp3 players so expensive?

I have noticed that mp3 players around the 32Gb area seem to be fairly expensive; I haven't seen any for less than £150. Conversely, players with smaller storage can be found at a much lower price, ...
3
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6answers
268 views

Hard drive that has the ability to “read” old data while it performs a write?

Is there a hard drive (protocol command, specific model, etc.) that, while writing new data over old data, it "read"/return the old data back to the controller/OS? (Analogous to a simultaneous read-...
1
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1answer
187 views

Why is it that disk storage has increased exponentially over the years, while disk access times barely improved?

If you look at how much we are able to store on our disks these days, you'd be appalled to notice that the time required to access information from the disks have grown very insignificantly compared ...
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9answers
11k views

Is it possible to build homemade storage device?

From what i know, HDD is built on magnetic recording technology. My question is, is it possible to create a storage device from scratch (USB, HDD, etc.)? I'm just eager to try out building some ...