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March 27, 2015 19:00
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hdparm -I Macbook Pro
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| # hdparm -I /dev/sda | |
| /dev/sda: | |
| ATA device, with non-removable media | |
| Model Number: APPLE SSD SM0512F | |
| Serial Number: S1K5NYAG225885 | |
| Firmware Revision: UXM2JA1Q | |
| Transport: Serial, ATA8-AST, SATA 1.0a, SATA II Extensions, SATA Rev 2.5, SATA Rev 2.6, SATA Rev 3.0 | |
| Standards: | |
| Used: unknown (minor revision code 0x0039) | |
| Supported: 8 7 6 5 | |
| Likely used: 8 | |
| Configuration: | |
| Logical max current | |
| cylinders 16383 16383 | |
| heads 16 16 | |
| sectors/track 63 63 | |
| -- | |
| CHS current addressable sectors: 16514064 | |
| LBA user addressable sectors: 268435455 | |
| LBA48 user addressable sectors: 977105060 | |
| Logical Sector size: 512 bytes | |
| Physical Sector size: 4096 bytes | |
| Logical Sector-0 offset: 0 bytes | |
| device size with M = 1024*1024: 477102 MBytes | |
| device size with M = 1000*1000: 500277 MBytes (500 GB) | |
| cache/buffer size = unknown | |
| Nominal Media Rotation Rate: Solid State Device | |
| Capabilities: | |
| LBA, IORDY(can be disabled) | |
| Queue depth: 32 | |
| Standby timer values: spec'd by Standard, no device specific minimum | |
| R/W multiple sector transfer: Max = 16 Current = 16 | |
| Recommended acoustic management value: 128, current value: 0 | |
| DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 udma5 *udma6 | |
| Cycle time: min=120ns recommended=120ns | |
| PIO: pio0 pio1 pio2 pio3 pio4 | |
| Cycle time: no flow control=120ns IORDY flow control=120ns | |
| Commands/features: | |
| Enabled Supported: | |
| * SMART feature set | |
| Security Mode feature set | |
| * Power Management feature set | |
| * Write cache | |
| * Look-ahead | |
| * Host Protected Area feature set | |
| * WRITE_BUFFER command | |
| * READ_BUFFER command | |
| * NOP cmd | |
| * DOWNLOAD_MICROCODE | |
| * SET_MAX security extension | |
| Automatic Acoustic Management feature set | |
| * 48-bit Address feature set | |
| * Device Configuration Overlay feature set | |
| * Mandatory FLUSH_CACHE | |
| * FLUSH_CACHE_EXT | |
| * SMART error logging | |
| * SMART self-test | |
| * General Purpose Logging feature set | |
| * WRITE_{DMA|MULTIPLE}_FUA_EXT | |
| * 64-bit World wide name | |
| * {READ,WRITE}_DMA_EXT_GPL commands | |
| * Segmented DOWNLOAD_MICROCODE | |
| * Gen1 signaling speed (1.5Gb/s) | |
| * Gen2 signaling speed (3.0Gb/s) | |
| * Gen3 signaling speed (6.0Gb/s) | |
| * Native Command Queueing (NCQ) | |
| * Phy event counters | |
| DMA Setup Auto-Activate optimization | |
| * Software settings preservation | |
| * SET MAX SETPASSWORD/UNLOCK DMA commands | |
| * WRITE BUFFER DMA command | |
| * READ BUFFER DMA command | |
| * Data Set Management TRIM supported (limit 8 blocks) | |
| Security: | |
| Master password revision code = 65534 | |
| supported | |
| not enabled | |
| not locked | |
| frozen | |
| not expired: security count | |
| supported: enhanced erase | |
| 6min for SECURITY ERASE UNIT. 32min for ENHANCED SECURITY ERASE UNIT. | |
| Logical Unit WWN Device Identifier: 5002538655584d30 | |
| NAA : 5 | |
| IEEE OUI : 002538 | |
| Unique ID : 655584d30 | |
| Integrity word not set (found 0x597b, expected 0x100a5) |
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For those who find this gist searching for "hdparm for macos", note that there is no hdparm command on macos. The gist shows the output of hdparm in linux looking at a Apple (re)branded SSD.
If you want to change power-management settings, like sleep time for external hard-drives, on macos, you use
pmset. See also http://mckinlay.net.nz/hdapm/ which includes a LaunchDaemon plist to reset values at every boot.The 2012 binary still launches on macos12-intel, and author says it should run on 10.12. The source code for hdapm.c and xcodeproject is avail if someone wants to see if it works on m1 (apple silicon) macos. Use case might be a script for stationary imac/pro that manually uses tmutil (or rsync via CCC) to do scheduled backups. At end of each backup, unmount, but do not eject the TimeMachine volume. When unmounted, the disk should spin down. Before starting the backup, the script should (re)mount the sleeping disk, and wait a few secs for the disk to spin up before starting the backup. After weighing pros/cons, I decide to use such as script, I'll add a link here. Hope this helps.