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Blob Type	Block Blob	Append Blob	Page Blob
Use case	Storing large files, streaming data	Logging, continuously adding data to an existing blob	Storing virtual hard disk (VHD) files
Max size	190.7 TiB	195 GB	8 TiB
Upload method	Uploaded in blocks, can be uploaded in parallel	Appended to sequentially	Uploaded in a single operation
Read method	Random access, read any block of data at any time	Sequential access, read data in order it was written	Random access, read any portion of the blob
Data modification	Can modify individual blocks	Can only append new data	Can modify individual pages
Pricing model	Based on storage size and number of operations	Based on storage size and number of append operations	Based on storage size and number of operations

注：当前取于2023年数据，实际以官方最新数据为准。

Azure blob different storage tiers

Hot Access Tier: The Hot Access Tier is designed for data that is regularly accessed, such as images on a website. It comes with a higher storage cost but lower access cost compared to other tiers.
Cool Access Tier: The Cool Access Tier is meant for data that isn’t accessed frequently, like customer invoices that need to be stored for at least 30 days. This tier offers lower storage costs but higher access costs than the Hot Tier.
Cold Tier: The Cold Access Tier is meant for data that not often accessed frequently. Data stored in the Cold Tier must be retained for at least 90 days. The cold tier has lower storage costs and higher access costs compared to the cool tier.
Archive Tier: The Cold Access Tier is meant for data that’s hardly accessed like long term backups. Data stored in the Cold Tier must be retained for at least 180 days

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