Recall that last week, Sandisk held its Investor Day, and investors clearly liked what they heard. The company used the event to highlight the longer-term growth opportunity tied to AI and, perhaps more importantly for the stock, laid out an aggressive financial framework for FY2028 through FY2030.On the product side, Sandisk expects AI inference to significantly increase demand for flash storage in data centers. The company sees the enterprise data-center flash market potentially reaching 1.2 zettabytes by 2030 and is developing higher-density NAND and High Bandwidth Flash (HBF) technology to capture that growth.Sandisk is also moving toward longer-term customer agreements designed to improve revenue visibility and reduce some of the traditional volatility associated with the NAND business. Those agreements already cover approximately 50% of expected FY2027 bits and roughly two-thirds of FY2028 bits.For investors, however, the financial targets were arguably the biggest takeaway. For FY2028 through FY2030, Sandisk is targeting:Mid-to-high teens revenue growthNon-GAAP gross margins potentially reaching ~80%Non-GAAP operating margins potentially reaching ~75%Operating expenses potentially falling to approximately 5% of revenueAdjusted free-cash-flow margins of ~50%100% of excess cash returned to shareholders after funding investment in the businessThose are ambitious targets, but if Sandisk can deliver, the financial model would be exceptionally profitable. The combination of mid-to-high teens revenue growth, operating margins potentially reaching 75%, and free-cash-flow margins around 50% would be impressive. The commitment to return excess cash to shareholders provides another potential catalyst.And judging by the price action since Investor Day, traders have taken notice.In last week's post, Sandisk had moved back above its 100-day moving average, currently at $1,409.30, as well as its 200-hour moving average at $1,457.80. Holding above those levels kept the technical bias tilted in favor of the buyers.The price then extended above the 38.2% retracement of the decline from the June all-time high at $1,519.71, with that level holding as support into Thursday's close. The stock surged 13.67% on Thursday, followed that with another 7.39% gain on Friday, and is up more than 9% today.From Thursday's low just ahead of the Investor Day event, the stock has now risen more than 34%.Not a bad run.So what comes next technically?Looking at the hourly chart, today's high reached $1,827.99, stopping about $10 short of the 61.8% retracement of the decline from the June 22 all-time high. That retracement comes in at $1,838.46 and is now the next key upside hurdle.A break above $1,838.46 would open the door toward an important swing area between approximately $1,863 and $1,952.That zone has a history of defining both support and resistance. The lower end initially acted as resistance in early June before becoming support later in the month. After the price eventually broke below the area in early July, subsequent rebounds stalled near the upper end on July 9 and July 10. From there, the stock began the sharp decline that ultimately took it to just above $1,000 on July 29, as valuation concerns and a broader correction in AI and semiconductor shares weighed on the stock.Since that July 29 low, however, the technical picture has changed dramatically. Sandisk shares are now up more than 80%, with last week's Investor Day providing the latest fundamental catalyst for the surge.The buyers clearly have control, but they are now approaching an important technical test.The 61.8% retracement at $1,838.46 is the first hurdle. Get and stay above that level, and the $1,863-$1,952 swing area becomes the next major target zone.After an 80% rally from the July low and a 34% surge since just before Investor Day, those levels should provide an important test of whether the buyers can keep the momentum going — or whether some profit-taking finally slows the advance. This article was written by Greg Michalowski at investinglive.com.