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Is all flash storage SSD?

Are all types of SSD flash, and vice versa? What's the difference?

Thanks! I appreciate the help. 

ITCS user
1818 Answers

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Top 5Real User

Flash drives may be made of SSDs/Solid state drives but All SSDs may not be Flash.


Solid State Drives

No seek time=Higher permanence than SAS/SATA

Not Fragile as SAS or SATA

Also offered in servers and some of storage systems as:

Read Optimized

Write Optimized

Mix Workload

Enterprise All-Flash Storage systems comes in two categories with reference to Disk types.

1). SSDs

2). NVMe

Within storage systems:

SSDs are being used for High to Extreme performance and are less expensive than NVMe.To get extreme permanence; you need to add more SSDs or bigger storage controllers.As a trade-off; bigger foot-print than NVMe.

NVMe are being used where you need Extreme performance with very small footprint but are very expensive than SSDs.

NVMe is an example of a flash drive which may have multiple SSDs/chips within one unit; it also come with dedicated Extreme performance controller build-in.

NVMe also comes as PCIE card type and as of 2.5" disk size.

author avatar

• Flash
o == NAND
o == Flash Memory chip
o ==NVM
o == SLC + MLC + TLC
o == small pieces of chip made for other storage manufacture use, not ready for end user;

o == (a few NAND chips + Interface)
o == (SATA SSD + SAS SSD + NVMe SSD + M.2 SSD)
o == 4 or 8 flash memory chips manufactured (welded together on PCB board) to become a Hard Drive, named Solid State Drive, ready for end user use, or for other storage manufacture use.

• All flash storage array
o == (lots of SSD + array Controller + SAN + LUN Masking + Dedupe + GUI + replication + Snapshot...)
o == put all type of SSD or other type of raw Flash together, with a provision interface, to become a storage array, ready for end user.

author avatar
Top 5LeaderboardReal User

I have seen a number of replies. Just clarifying.
There are 3 storage Tiers with NVMe, SSD and SAS /NL
SSD is a disk that doesn't have moving parts like SAS and NL
Now, Flash is the implementation of SSD. SSDs are made mostly of flash memory

author avatar

I believe all-flash means the storage box with the provision of Flash media type only, it may be SSDs it may be either flash media like IBM's Flash Core modules. The All-Flash hardware will only support SSDs, Flash Drives or IBM's Flash core modules. But if it is Hybrid Storage then it is capable of accommodating other media types like NLSAS, SAS drives along with SSDs.

author avatar
Top 10Real User

Flash drives are a type of SSD (Solid-State Drives). There are lot more new technologies of Solid State Drives

author avatar

Flash or All Flash?
As we all know, all mainstream SSD drives are now produced with Flash technology. The subject that comes to my mind when I say All Flash; All Flash disks have their own processors and can do things like deduplication, data analysis and do not load the main processor without going to the main processor. When I examine IBM's technology in this regard, it is more successful than others.

author avatar
LeaderboardReal User

An SSD is a Solid State Drive. In a solid-state drive, you find no more engine and head to write the data on a platter. You use flash memory technology to write data. Flash memory (Fash NAND create by Toshiba in the 1980's) is like an EEPROM that stores data and keeps it without needing to be electrically powered. Flash memory is composed of cells based on a MOS transistor.

You can find 3 types of Flash Memory (SLC Single-level cell one information store, MLC Multi-level Cell 2 information store, TLC triple-level cell 3 information store).

Then you can find different kind communication interfaces to the SSD: SATA, SAS, NVMe, M.2 So at the moment the majority of SSD used Flash memory technology. Intel and Micron developed a new technology in 2015 3D Xpoint 1000 times faster than Flash Nand

author avatar
Top 5Real User

Yes, All flash storage can only supports SSDs and as we all know SSD is a flash drive type of storage device.

author avatar

Basically, yes. SSD stands for Solid State Disk (or Device) and Flash memory makes up 99%+ of SSDs in the market today. Some newer technologies such as 3-D Xpoint memory (e.g. Intel Optane) are used for some SSDs, but they are still cost prohibitive for consumers for the most part.

author avatar
Real User

The main difference of SSDs from conventional disks is that the seedling is much greater. in addition to that deduplicity and the major compress.

author avatar
Real User

My 2 cents..
All SSD drives that you get these days are flash based. SSD is a drive without moving parts (actuator, spindle, arm swing, magnetic platter) and flash is the technology that enables data to be written to it.

author avatar
LeaderboardReal User

Solid State Disk is the kind of technology. Like all memory chips used to create a disk with no spinning platters or articulating moving head parts. Then there are different kinds of memory chips used to create a disk. Then there are different modes of accessing the memory cells in the disk. The difference in flash drive storage is the combination of the chips and accessing the cells in the chips that set apart the manufacturing companies on the market. This technology has benefit of interest on all data which it creates over time.

author avatar
Top 5LeaderboardReal User

SSD used a flash way to write data. SSD has no volatile data as they're written in a flash memory like RAM, but RAM clear data during reboot or stop&start flash technology permit data resiliency.

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SSD stands for Solid State Disk, and it means storage that doesn’t require moving parts. This concept has been around for decades, and originally it was RAM-based, i.e. the storage was similar to today’s regular computer memory
Flash storage is also relatively old technology, but started as a way to permanently store information without power being applied.
you dont need to compare
SSD just means a hard disk that doesn’t move while Flash is a type of memory that is very fast and doesn’t require continuous power (non-volatile) SSDs used to use RAM, but now use Flash instead

author avatar

The short answer would be yes.

SATA is the dominant interface for connecting an SSD to the PC. It employs the command protocol AHCI (it also supports IDE) which was built with slower spinning disks in mind rather than flash memory.

SATA transfer rates begin at 150 MB/s and max out at 600 MB/s for third-generation technology.

For most consumer uses of SSDs, this is absolutely adequate.

NVME is a protocol that is fast becoming used in the field.

NVMe allows the SSD device to be connected directly to the PCIe lanes of the host computer.

author avatar
Top 10Real User

Dell uses very specific and qualified SSDs. The SSDs have to meet a certain standard. The product has various warranties and performance/recovery guarantees.

You can get more info from the Dell EMC website.

author avatar

SSD is a short form of Solid State Drive which is persistent flash memory. There are different types of flash like SLC, TLC, NAND and more that you can ready about anywhere like WikiPedia or just a Google search. There are newer type of storage like NVMe & Optane but I believe they are generally NOT referred to as SSD as they pretty much break the "drive" notion and are used as circuit boards that go directly on to the bus.

All flash is not SSD. For example, flash memory is used in USB/Pen/Thumb drives, SD cards and in several other forms that are not a "drive" that connects to SATA/SAS interfaces.

author avatar

There is confusion across the terminology for some time. The modern SSD hard drives are flash-based so today there is no much difference between the two. In the past, we used to have RAM-based SSD’s but now all the SSD’s are flash-based.

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