Created
November 4, 2012 17:10
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Query band size of a sparsebundle (also accessible in Info.plist of bundle)
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| # find out how big the sparse-band-size is in a mounted volume | |
| hdiutil info -verbose | grep band-size | |
| # default Time Machine sparsbundle virtual-band-size = 16384 (8MB) | |
| # create-sparsebundle's virtual-band-size = 262144 (128MB) |
For anyone finding this 10 years on (2023...)
My short investigation into my NAS Timemachine volume (Synology DSM 7.x) shows a band size of 256MB. I believe this must reflect Timemachine picking a much better default than in the past, probably based on some combination of OS Version (Monterey), drive location (NAS v local), and volume size (mine is 11TB).
Creating a new Time Machine backup in macOS Sonoma, the band size is now 8GB.
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Alternatively, look at the Info.plist in the .sparsebundle. This band-size is 512x the virtual-band-size returned by hdiutil.
Time Machine default band-size:
8388608
create-sparsebundles' band-size:
134217728