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The limit on partition size was dictated by the 8-bit signed count of sectors per cluster, which originally had a maximum power-of-two value of 64. With the standard hard disk sector size of 512 bytes, this gives a maximum of 32 KB cluster size, thereby fixing the "definitive" limit for the FAT16 partition size at 2 GB for sector size 512.
MS-DOS/PC DOS require this value to be a multiple of 16. The maximum value supported on floppy disks is 240, [6] the maximum value supported by MS-DOS/PC DOS on hard disks is 512. [6] DR-DOS supports booting off FAT12/FAT16 volumes, if the boot file is located in the first 2048 root directory entries. 0x013 0x08 2 Total logical sectors. 0 for ...
If the actual size of the disk exceeds the maximum partition size representable using the legacy 32-bit LBA entries in the MBR partition table, the recorded size of this partition is clipped at the maximum, thereby ignoring the rest of the disk. This amounts to a maximum reported size of 2 TiB, assuming a disk with 512 bytes per sector (see 512e).
Because APM allows 32 bits worth of logical blocks, the historical size of an APM formatted disk using small blocks [3] is limited to 2 TiB. [ 4 ] The Apple Partition Map maps out all space used (including the map) and unused (free space) on disk, unlike the minimal x86 master boot record that only accounts for used non-map partitions.
While storage devices usually have their size expressed in powers of 10 (for instance a 1 TB Solid State Drive will contain at least 1,000,000,000,000 (10 12, 1000 4) bytes), filesystem limits are invariably powers of 2, so usually expressed with IEC prefixes. For instance, a 1 TiB limit means 2 40, 1024 4 bytes. Approximations (rounding down ...
For example, the FAT32 file system does not support files larger than 4 GiB−1 (with older applications even only 2 GiB−1); the variant FAT32+ does support larger files (up to 256 GiB−1), but (so far) is only supported in some versions of DR-DOS, [2] [3] so users of Microsoft Windows have to use NTFS or exFAT instead.
The M3 Pro has 12 CPU cores (6 performance and 6 efficiency), while the M3 Max has 16 CPU cores (12 performance and 4 efficiency); both have a 16-core Neural Engine. The M3 Pro and M3 Max have an 18-core and 40-core GPU, and a 192-bit and 512-bit LPDDR5 memory bus supporting 150 and 400 GB/s bandwidth respectively.
The default size of an extent record in the classic Mac OS is 1 KB and 4 KB in macOS. The Attributes File is a new B-tree in HFS Plus that does not have a corresponding structure in HFS. The Attributes File can store three different types of 4 KB records: Inline Data Attribute records, Fork Data Attribute records and Extension Attribute records.