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As manufacturers do not necessarily agree on precise attribute definitions and measurement units, the following list of attributes is a general guide only. Drives do not support all attribute codes (sometimes abbreviated as "ID", for "identifier", in tables). Some codes are specific to particular drive types (magnetic platter, flash, SSD ...
This avoids a certain amount of disk I/O operations. Append only a +a to set-a to clear [note 1] A file with the a attribute set can only be open in append mode for writing. Compressed c +c to set-c to clear [note 2] A file with the c attribute set is automatically compressed on the disk by the kernel. A read from this file returns uncompressed ...
Shows S.M.A.R.T. attributes Hard drive self-testing Notification Notes AIDA64: Windows: Trialware [1] GUI IDE(PATA), SATA, NVMe eSATA, USB Some RAID controllers Yes No Monitoring only available in the Business Edition [2]
(User and System) Compressed: Read-only attribute for files compressed using HFS+ Compression In these systems, the chflags and ls commands can be used to change and display file attributes. To change a "user" attribute on a file in 4.4BSD-derived operating systems, the user must be the owner of the file or the superuser; to change a "system ...
Most file systems include attributes of files and directories that control the ability of users to read, change, navigate, and execute the contents of the file system. In some cases, menu options or functions may be made visible or hidden depending on a user's permission level; this kind of user interface is referred to as permission-driven.
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Microsoft-defined GPT attribute flags for BDPs [1] Bit number Meaning 60: The volume is read-only and may not be mounted read-write. 62: The volume is hidden. 63: The operating system may not automatically assign a drive letter to the volume.
Device configuration overlay (DCO) is a hidden area on many of today's hard disk drives (HDDs). Usually when information is stored in either the DCO or host protected area (HPA), it is not accessible by the BIOS (or UEFI), OS, or the user. However, certain tools can be used to modify the HPA or DCO.