A magnetic recording medium includes a layer structure including a magnetic layer, a base layer, and a back layer in this order, in which an average thickness t.sub.T is t.sub.T≤5.5 μm, a dimensional variation Δw in a width direction to tension change in a longitudinal direction is 660 ppm/N≤Δw, and a surface roughness R.sub.abe of the base layer on a side of the back layer is 4.2 nm≤R.sub.abe≤8.5 nm.

Techniques to transmit encoded data along a physical medium, e.g. tape, and decode the transmitted data along the physical medium are provided. Some techniques include logic to encode data transmitted along a physical medium, such as a tape suitable for any purpose including the encoding of multimedia data, where the encoding is pursuant to a conversion between a first and second colorspace. The logic may further be configured to decode the data once it is received at a node along the tape, where the colorspace conversion provides the basis, key, or cipher for preforming the decoding operation. The logic may be further configured to alter the encryption and decryption basis, key, or cypher by altering the colorspace scheme defining the encoding (and by extension the decoding) during transmission, including a transmission that takes place after a previous transmission governed by the previously defined (and subsequently altered) colorspace conversion scheme. Other embodiments are described and claimed.

An information processing device performs control to record deletion information indicating that an object with a designated object ID has been deleted, on a recording medium, in a case where a specific object ID is designated and an instruction to delete the object is input, for a magnetic tape on which an object that includes data and metadata related to the data and that is assigned an object ID as identification information is recorded, the object being assigned an object ID in a case where the object is updated different from an object ID of the object before the update.

The magnetic tape includes a non-magnetic support; and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic support, in which the magnetic layer has a timing-based servo pattern, a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm, and an isoelectric point of a surface zeta potential of the magnetic layer is equal to or greater than 5.5.

The magnetic tape includes a non-magnetic support; a non-magnetic layer including a non-magnetic powder and a binding agent on the non-magnetic support; and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic layer, in which a total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 μm, the magnetic layer has a servo pattern, and an isoelectric point of a surface zeta potential of the magnetic layer is equal to or greater than 5.5.

A data storage device configured to access a magnetic tape is disclosed, wherein the data storage device comprises at least one head configured to access the magnetic tape. A first plurality of data blocks are encoded into a first plurality of ECC sub-blocks including a first ECC sub-block, and the first plurality of ECC sub-blocks are encoded into a first ECC super-block. The first ECC sub-block is written to the magnetic tape, and a write-verify of the first ECC sub-block is executed by reading the first ECC sub-block. When the write-verify passes, a second plurality of data blocks are encoded into a second ECC super-block, and when the write-verify fails, a third plurality of data blocks and the first ECC sub-block are encoded into the second ECC super-block, wherein the second ECC super-block is written to the magnetic tape.

A method includes receiving a humidity level in a tape library and determining whether the humidity level is in a predefined range indicative of safe operation. In response to determining that the humidity level is in the predefined range, the method includes allowing performance of operations on magnetic recording tapes. In response to determining that the humidity level is not in the predefined range, the method includes preventing performance of the operations on magnetic recording tapes. A drive-implemented method includes detecting a humidity level within a housing of a tape drive and determining whether the humidity level is in a predefined range indicative of safe operation.

An information processing device includes a recording unit that records a plurality of objects including data and metadata related to the data on a magnetic recording medium, and executes, after recording at least one of the objects, processing of recording first set data which is a set of the metadata included in the object. The first set data is the set of the metadata included in the object recorded after recording the first set data that is recorded immediately before. The magnetic recording medium has a magnetic layer containing a ferromagnetic powder and a binding agent on a non-magnetic support. A difference between spacings S.sub.0.5 and S.sub.13.5 measured under pressures of 0.5 atm and 13.5 atm by an optical interference method after n-hexane cleaning on a surface of the magnetic layer is equal to or less than 3.0 nm.

The present disclosure generally relates to a tape drive including a tape head. The tape head comprises at least one same gap verify (SGV) module comprising a plurality of write transducer and read transducer pairs disposed on a substrate. Each pair comprises a null shield disposed between the write transducer and the read transducer. The null shield is used to create a null region, or a region where write flux goes to zero, and comprises laminated antiferromagnetic coupling materials to protect writer flux from going to the read transducer. The read transducer is disposed in the null region. The SGV module is configured to write data to a tape using the write transducer of each pair and read verify the data written on the tape using the read transducer of each pair such that the write transducer and read transducer of each pair are concurrently operable.

A non-contact communication medium according to one disclosed embodiment includes a memory unit, a power generation unit, a power monitoring unit, and a capacitance control unit. The power generation unit includes a resonant circuit and a rectification circuit, and generates electric power to be supplied to the memory unit. The resonant circuit includes an antenna coil and resonant capacitance unit having a variable capacitance value, and the rectification circuit rectifies a resonant output of the resonant circuit. The power monitoring unit includes a current adjustment element, a reference voltage generation source, and an operational amplifier. The operational amplifier controls the current adjustment element such that an output voltage of the rectification circuit is equal to a reference voltage from the reference voltage generation source. The capacitance control unit is configured to control the resonant capacitance unit on the basis of an output of the operational amplifier.