If you're talking about computers, it's a bit. Bit -> byte -> kilobyte -> megabyte, etc.
If you're talking about self storage units, it's a 5' x 5' locker.
The smallest addressable unit of storage on a disk is called a sector.
The smallest storage access unit on an IDE hard drive is a sector.
One bit.
bit
The smallest unit of measurement used to describe the storage capacity of a computer is called a bit. It is a binary digit that can represent either a 0 or a 1, and is the basic building block of all digital data.
The largest DVD Storage unit available at Target holds up to 250 DVDs. The smallest holder holds 15 DVDs.
The smallest unit of information storage is a bit, which can represent either a 0 or a 1 in binary code. Multiple bits are combined to form larger units of storage like bytes, which typically consist of 8 bits.
A unit of storage refers to the smallest amount of data that can be accessed, processed, or stored by a computer system. This unit can vary in size and typically includes measurements such as bits, bytes, kilobytes, megabytes, gigabytes, or terabytes. It is used to quantify the capacity of storage devices or the amount of data being processed.
A byte is the smallest storage size, made up of only 8 bits.
A record is the largest unit of information in the data hierarchy. The smallest unit in the data hierarchy is called a data field.
The smallest unit is a quark. I'm not sure what you mean by 'of classification'
If it is a molecular compound, the smallest unit is called a molecule. If it is an ionic compound, the smallest unit is called a formula unit.